diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md
index ddf1e660f3..b7e624fc98 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md
@@ -57,7 +57,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md
index 77c11d1959..27ad4bd111 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md
@@ -59,7 +59,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md
index 68d20cf7c8..7bea25cec3 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md
@@ -56,7 +56,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md
index 4f16e935bd..0680866489 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md
@@ -52,7 +52,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md
index bbb8c8ef78..79c0a24d70 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md
@@ -54,7 +54,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md
index 923b025652..02d113b64e 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md
@@ -61,7 +61,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md
index d4fb624b5d..118579dbf0 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md
@@ -43,7 +43,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md
index afc8826d94..fa462a4a85 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md
@@ -43,7 +43,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md
index a05ba59bf4..f0b73efeea 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md
@@ -40,7 +40,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md
index 25888b8ea4..efa88d1d29 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md
@@ -44,7 +44,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md
index 205063b618..609b9586ec 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md
@@ -56,7 +56,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md
index 1e5c4f7ebf..b0053f900a 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md
@@ -59,7 +59,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md
index 5fecc78b6c..815ba258ab 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md
@@ -63,7 +63,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md
index 05124b0a93..c57cf72333 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md
@@ -52,7 +52,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md
index 6ca884ef24..734e328dc8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md
@@ -60,7 +60,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md
index fce99c0b5a..fa495aaa45 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md
@@ -80,7 +80,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md
index 5ff41c15fb..fabd5d08b8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md
@@ -43,7 +43,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md
index 6f745bcb75..27b4ba3fe5 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md
@@ -62,7 +62,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md
index 9ec09d37f4..61da06caa7 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md
@@ -45,7 +45,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md
index 34ba825f63..4965bd0183 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md
@@ -58,7 +58,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md
index 942dac3813..a55a7cfd7c 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md
@@ -63,7 +63,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md
index 40c7d21763..1944d2316a 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md
@@ -43,7 +43,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md
index 1c380bd52d..ec15c6b351 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md
@@ -61,7 +61,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md
index 05ba455383..801522cb65 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md
@@ -53,7 +53,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md
index 24974bde52..0a78237499 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md
@@ -63,7 +63,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md
index e9038e19d9..cd0ac948a6 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md
@@ -57,7 +57,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md
index 50a4ed3fe0..40f44ded2c 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md
@@ -52,7 +52,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md
index a5506fdc25..4caaf7ee66 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md
@@ -40,7 +40,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md
index 5bd0846e8e..fe71dd9a9f 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md
@@ -37,7 +37,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.english.md
index 580dce75da..5c70b2df27 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.english.md
@@ -55,7 +55,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md
index 935e2a508d..4d9a7b489f 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md
@@ -37,7 +37,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md
index 6acc3094b6..76b2737aad 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md
@@ -37,7 +37,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md
index 38733e8537..08ba8677d9 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md
@@ -66,7 +66,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md
index 741eebdc8f..d6052cd3a6 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md
@@ -51,7 +51,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md
index 6b9230acac..e39d501beb 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md
@@ -37,7 +37,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md
index d74301ae5a..b5776eb9b7 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md
@@ -37,7 +37,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md
index 3b249f768e..1fb856bde5 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md
@@ -40,7 +40,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md
index 42635d7435..7f2fb6ba80 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md
@@ -41,7 +41,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md
index 387729d1ff..f59b07c1c3 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md
@@ -37,7 +37,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md
index 0bbaca79f8..82ab351e63 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md
@@ -41,7 +41,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md
index 48f30b71cf..fc2adb36c8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md
@@ -41,7 +41,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md
index 5ebfc100f7..e278885b7f 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md
@@ -42,7 +42,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md
index 899b034044..ff1b812801 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md
@@ -45,7 +45,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md
index b7948d3f7f..1d07463911 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md
@@ -41,7 +41,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md
index 546c680a5e..84a05393bd 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md
@@ -73,7 +73,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md
index 73933ecc20..c4f3da41cf 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md
@@ -56,7 +56,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md
index bb34b94642..54acc7c98b 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md
@@ -42,7 +42,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md
index ac1813c23e..75f46fef21 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md
@@ -42,7 +42,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md
index 2503960959..bf8ce4fe0d 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md
@@ -46,7 +46,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md
index c722d03310..6aa2ff4df1 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md
@@ -48,7 +48,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md
index d21e5285d0..9c55260079 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md
@@ -53,7 +53,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md
index 3249ba022c..8b914d4413 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md
@@ -45,7 +45,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md
index fcca6935ef..10337240c8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md
@@ -44,7 +44,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md
index 0f578189e2..14118cce9f 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md
@@ -43,7 +43,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md
index fa3b28d2f2..e1b852eb54 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md
@@ -40,7 +40,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md
index 64d8419651..521d77e38e 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md
@@ -48,7 +48,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md
index dcd5a72969..9ccfaafa1c 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md
@@ -43,7 +43,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md
index e3c9ea953e..b358af4d65 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md
@@ -40,7 +40,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md
index e9284d0b28..7b05e308a6 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md
@@ -44,7 +44,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md
index 503528e935..d19dd86051 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md
@@ -46,7 +46,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md
index afeecb480f..95fe941a8d 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md
@@ -45,7 +45,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md
index 2168e18cd2..98a35e140b 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md
@@ -48,7 +48,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md
index 25ca735cd1..48a9db7159 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md
@@ -42,7 +42,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md
index e4e21569ed..c0700747fd 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md
@@ -46,7 +46,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md
index 6f9ba8348f..7f4d17bcb1 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md
@@ -46,7 +46,11 @@ tests:
```js
-// solution required
+/**
+ Backend challenges don't need solutions,
+ because they would need to be tested against a full working project.
+ Please check our contributing guidelines to learn more.
+*/
```