diff --git a/curriculum/gulpfile.js b/curriculum/gulpfile.js
index d5a6161183..c53cd541eb 100644
--- a/curriculum/gulpfile.js
+++ b/curriculum/gulpfile.js
@@ -4,7 +4,7 @@ const through2 = require('through2');
 
 const { locale } = require('../config/env.json');
 const { getChallengesForLang } = require('./getChallenges');
-const { testedLangs } = require('./utils');
+const { testedLang } = require('./utils');
 const lintMarkdown = require('../tools/scripts/lint');
 
 /**
@@ -28,7 +28,7 @@ function watchFiles() {
 }
 
 function lint() {
-  return gulp.src(globLangs(testedLangs()), { read: false }).pipe(
+  return gulp.src(globLang(testedLang()), { read: false }).pipe(
     through2.obj(function obj(file, enc, next) {
       lintMarkdown(file, next);
     })
@@ -41,8 +41,8 @@ const defaultTask = gulp.series(generateCurriculum, watchFiles);
  * Helper functions
  **/
 
-function globLangs(langs) {
-  return langs.map(lang => `./challenges/${lang}/**/*.md`);
+function globLang(lang) {
+  return `./challenges/${lang}/**/*.md`;
 }
 
 gulp.task('default', defaultTask);
diff --git a/curriculum/test/test-challenges.js b/curriculum/test/test-challenges.js
index dbf5783db2..027e3cf75b 100644
--- a/curriculum/test/test-challenges.js
+++ b/curriculum/test/test-challenges.js
@@ -46,7 +46,7 @@ const {
 
 const { dasherize } = require('../../utils/slugs');
 
-const { testedLangs } = require('../utils');
+const { testedLang } = require('../utils');
 
 const {
   buildDOMChallenge,
@@ -124,22 +124,15 @@ async function setup() {
   global.Worker = createPseudoWorker(await newPageContext(browser));
   page = await newPageContext(browser);
   await page.setViewport({ width: 300, height: 150 });
-  const testLangs = testedLangs();
-  if (testLangs.length > 1)
-    throw Error(
-      `Testing more than one language at once is not currently supported
-please change the TEST_CHALLENGES_FOR_LANGS env variable to a single language`
-    );
-  const challengesForLang = await Promise.all(
-    testLangs.map(lang => getChallenges(lang))
-  );
+
+  const lang = testedLang();
+
+  let challenges = await getChallenges(lang);
 
   // the next few statements create a list of all blocks and superblocks
   // as they appear in the list of challenges
-  const blocks = challengesForLang[0].challenges.map(({ block }) => block);
-  const superBlocks = challengesForLang[0].challenges.map(
-    ({ superBlock }) => superBlock
-  );
+  const blocks = challenges.map(({ block }) => block);
+  const superBlocks = challenges.map(({ superBlock }) => superBlock);
   const targetBlockStrings = [...new Set(blocks)];
   const targetSuperBlockStrings = [...new Set(superBlocks)];
 
@@ -151,11 +144,11 @@ please change the TEST_CHALLENGES_FOR_LANGS env variable to a single language`
     ).bestMatch.target;
 
     console.log(`\nsuperBlock being tested: ${filter}`);
-    challengesForLang[0].challenges = challengesForLang[0].challenges.filter(
+    challenges = challenges.filter(
       challenge => challenge.superBlock === filter
     );
 
-    if (!challengesForLang[0].challenges.length) {
+    if (!challenges.length) {
       throw new Error(`No challenges found with superBlock "${filter}"`);
     }
   }
@@ -167,30 +160,26 @@ please change the TEST_CHALLENGES_FOR_LANGS env variable to a single language`
     ).bestMatch.target;
 
     console.log(`\nblock being tested: ${filter}`);
-    challengesForLang[0].challenges = challengesForLang[0].challenges.filter(
-      challenge => challenge.block === filter
-    );
+    challenges = challenges.filter(challenge => challenge.block === filter);
 
-    if (!challengesForLang[0].challenges.length) {
+    if (!challenges.length) {
       throw new Error(`No challenges found with block "${filter}"`);
     }
   }
 
   const meta = {};
-  for (const { lang, challenges } of challengesForLang) {
-    meta[lang] = {};
-    for (const challenge of challenges) {
-      const dashedBlockName = dasherize(challenge.block);
-      if (!meta[dashedBlockName]) {
-        meta[lang][dashedBlockName] = (await getMetaForBlock(
-          dashedBlockName
-        )).challengeOrder;
-      }
+  for (const challenge of challenges) {
+    const dashedBlockName = dasherize(challenge.block);
+    if (!meta[dashedBlockName]) {
+      meta[dashedBlockName] = (await getMetaForBlock(
+        dashedBlockName
+      )).challengeOrder;
     }
   }
   return {
     meta,
-    challengesForLang
+    challenges,
+    lang
   };
 }
 
@@ -204,7 +193,7 @@ function cleanup() {
   spinner.stop();
 }
 
-function runTests({ challengesForLang, meta }) {
+function runTests(challengeData) {
   // rethrow unhandled rejections to make sure the tests exit with -1
   process.on('unhandledRejection', err => {
     throw err;
@@ -214,9 +203,7 @@ function runTests({ challengesForLang, meta }) {
     after(function() {
       cleanup();
     });
-    for (const challenge of challengesForLang) {
-      populateTestsForLang(challenge, meta);
-    }
+    populateTestsForLang(challengeData);
   });
   spinner.text = 'Testing';
   run();
@@ -233,7 +220,7 @@ async function getChallenges(lang) {
         return [...challengeArray, ...flatten(challengesForBlock)];
       }, [])
   );
-  return { lang, challenges };
+  return challenges;
 }
 
 function validateBlock(challenge) {
@@ -245,7 +232,7 @@ function validateBlock(challenge) {
   }
 }
 
-function populateTestsForLang({ lang, challenges }, meta) {
+function populateTestsForLang({ lang, challenges, meta }) {
   const mongoIds = new MongoIds();
   const challengeTitles = new ChallengeTitles();
   const validateChallenge = challengeSchemaValidator(lang);
@@ -257,7 +244,7 @@ function populateTestsForLang({ lang, challenges }, meta) {
       describe(challenge.block || 'No block', function() {
         describe(challenge.title || 'No title', function() {
           it('Matches a title in meta.json', function() {
-            const index = meta[lang][dashedBlockName].findIndex(
+            const index = meta[dashedBlockName].findIndex(
               arr => arr[1] === challenge.title
             );
 
@@ -269,7 +256,7 @@ function populateTestsForLang({ lang, challenges }, meta) {
           });
 
           it('Matches an ID in meta.json', function() {
-            const index = meta[lang][dashedBlockName].findIndex(
+            const index = meta[dashedBlockName].findIndex(
               arr => arr[0] === challenge.id
             );
 
diff --git a/curriculum/utils.js b/curriculum/utils.js
index c452b4ac84..cfd3b1b811 100644
--- a/curriculum/utils.js
+++ b/curriculum/utils.js
@@ -1,23 +1,18 @@
 const path = require('path');
 require('dotenv').config({ path: path.resolve(__dirname, '../.env') });
 
-const supportedLangs = [
-  'arabic',
-  'chinese',
-  'english',
-  'portuguese',
-  'russian',
-  'spanish'
-];
+const supportedLangs = ['chinese', 'english'];
 
-exports.testedLangs = function testedLangs() {
-  if (process.env.TEST_CHALLENGES_FOR_LANGS) {
-    const filterLangs = process.env.TEST_CHALLENGES_FOR_LANGS.split(',').map(
-      lang => lang.trim().toLowerCase()
-    );
-    return supportedLangs.filter(lang => filterLangs.includes(lang));
+exports.testedLang = function testedLang() {
+  if (process.env.LOCALE) {
+    if (supportedLangs.includes(process.env.LOCALE)) {
+      return process.env.LOCALE;
+    } else {
+      throw Error(`${process.env.LOCALE} is not a supported language.
+      Before the site can be built, this language needs to be manually approved`);
+    }
   } else {
-    return [...supportedLangs];
+    throw Error('LOCALE must be set for testing');
   }
 };
 
diff --git a/docs/how-to-work-on-coding-challenges.md b/docs/how-to-work-on-coding-challenges.md
index c91558de73..d1f9707ddf 100644
--- a/docs/how-to-work-on-coding-challenges.md
+++ b/docs/how-to-work-on-coding-challenges.md
@@ -357,7 +357,7 @@ You are also able to test one challenge individually by performing the following
 Once you have verified that each challenge you've worked on passes the tests, [please create a pull request](https://github.com/freeCodeCamp/freeCodeCamp/blob/master/docs/how-to-open-a-pull-request.md).
 
 > [!TIP]
-> You can set the environment variable `TEST_CHALLENGES_FOR_LANGS` in the `.env` to the language of the challenge(s) you need to test.
+> You can set the environment variable `LOCALE` in the `.env` to the language of the challenge(s) you need to test.
 > 
 > The currently accepted values are `english` and `chinese`, with `english` being set by default.
 
diff --git a/docs/i18n-languages/polish/how-to-work-on-coding-challenges.md b/docs/i18n-languages/polish/how-to-work-on-coding-challenges.md
index 9298a3c7c9..7cb2037e4c 100644
--- a/docs/i18n-languages/polish/how-to-work-on-coding-challenges.md
+++ b/docs/i18n-languages/polish/how-to-work-on-coding-challenges.md
@@ -311,7 +311,7 @@ function myFunc() {
 
 Przed utworzeniem [prośby o wyciągnięcie](how-to-open-a-pull-request.md) dla Twoich zmian, musisz sprawdzić, czy wprowadzone zmiany nie powodują nieumyślnie problemów z wyzwaniem.  Aby przetestować wszystkie wyzwania, należy wykonać "test npm run test:curriculum". Aby zaoszczędzić czas możesz ograniczyć testy do jednego wyzwania wykonując następujące kroki:
 
-1. W pliku `.env` ustaw zmienną środowiskową `TEST_CHALLENGES_FOR_LANGS` na język wyzwania (wyzwań), które musisz przetestować.  Obecnie akceptowane wartości to `angielski`, `arabski`, `chiński`, `portugalski`, `rosyjski` i `hiszpański`.
+1. W pliku `.env` ustaw zmienną środowiskową `LOCALE` na język wyzwania (wyzwań), które musisz przetestować.  Obecnie akceptowane wartości to `angielski`, `arabski`, `chiński`, `portugalski`, `rosyjski` i `hiszpański`.
 
 2.  Przełączyć do katalogu `curriculum`:
 
diff --git a/sample.env b/sample.env
index b3625a09a2..bc88d48fe4 100644
--- a/sample.env
+++ b/sample.env
@@ -46,7 +46,6 @@ WEBHOOK_PROXY_URL=''
 
 LOCALE=english
 
-TEST_CHALLENGES_FOR_LANGS=english
 DOCKER_HOST_LOCATION=localhost
 
 GHOST_CLIENT_KEY=123abc