diff --git a/challenges/08-coding-interview-questions-and-take-home-assignments/project-euler-problems.json b/challenges/08-coding-interview-questions-and-take-home-assignments/project-euler-problems.json
index c79d6681c3..f24e8661b1 100644
--- a/challenges/08-coding-interview-questions-and-take-home-assignments/project-euler-problems.json
+++ b/challenges/08-coding-interview-questions-and-take-home-assignments/project-euler-problems.json
@@ -421,17 +421,134 @@
       "type": "bonfire",
       "title": "Problem 13: Large sum",
       "tests": [
-        "assert.strictEqual(euler13(), 5537376230, 'message: <code>euler13()</code> should return 5537376230.');"
+        "assert.strictEqual(largeSum(testNums), 8348422521, 'message: <code>largeSum(testNums)</code> should return 8348422521.');",
+        "assert.strictEqual(largeSum(fiftyDigitNums), 5537376230, 'message: <code>largeSum(fiftyDigitNums)</code> should return 5537376230.');"
       ],
-      "solutions": [],
+      "solutions": ["function largeSum(arr) {\n\n  let sum = 0;\n\n  arr.forEach(function(num) {\n    sum += parseInt(num, 10);\n  });\n\n  sum = sum.toString(10);\n\n  sum = sum.substr(0, 1) + sum.substr(2);\n\n  let firstTen = sum.slice(0, 10);\n  return parseInt(firstTen, 10);\n}"],
       "translations": {},
+      "head": [
+        "const fiftyDigitNums = [",
+        "  '37107287533902102798797998220837590246510135740250',",
+        "  '46376937677490009712648124896970078050417018260538',",
+        "  '74324986199524741059474233309513058123726617309629',",
+        "  '91942213363574161572522430563301811072406154908250',",
+        "  '23067588207539346171171980310421047513778063246676',",
+        "  '89261670696623633820136378418383684178734361726757',",
+        "  '28112879812849979408065481931592621691275889832738',",
+        "  '44274228917432520321923589422876796487670272189318',",
+        "  '47451445736001306439091167216856844588711603153276',",
+        "  '70386486105843025439939619828917593665686757934951',",
+        "  '62176457141856560629502157223196586755079324193331',",
+        "  '64906352462741904929101432445813822663347944758178',",
+        "  '92575867718337217661963751590579239728245598838407',",
+        "  '58203565325359399008402633568948830189458628227828',",
+        "  '80181199384826282014278194139940567587151170094390',",
+        "  '35398664372827112653829987240784473053190104293586',",
+        "  '86515506006295864861532075273371959191420517255829',",
+        "  '71693888707715466499115593487603532921714970056938',",
+        "  '54370070576826684624621495650076471787294438377604',",
+        "  '53282654108756828443191190634694037855217779295145',",
+        "  '36123272525000296071075082563815656710885258350721',",
+        "  '45876576172410976447339110607218265236877223636045',",
+        "  '17423706905851860660448207621209813287860733969412',",
+        "  '81142660418086830619328460811191061556940512689692',",
+        "  '51934325451728388641918047049293215058642563049483',",
+        "  '62467221648435076201727918039944693004732956340691',",
+        "  '15732444386908125794514089057706229429197107928209',",
+        "  '55037687525678773091862540744969844508330393682126',",
+        "  '18336384825330154686196124348767681297534375946515',",
+        "  '80386287592878490201521685554828717201219257766954',",
+        "  '78182833757993103614740356856449095527097864797581',",
+        "  '16726320100436897842553539920931837441497806860984',",
+        "  '48403098129077791799088218795327364475675590848030',",
+        "  '87086987551392711854517078544161852424320693150332',",
+        "  '59959406895756536782107074926966537676326235447210',",
+        "  '69793950679652694742597709739166693763042633987085',",
+        "  '41052684708299085211399427365734116182760315001271',",
+        "  '65378607361501080857009149939512557028198746004375',",
+        "  '35829035317434717326932123578154982629742552737307',",
+        "  '94953759765105305946966067683156574377167401875275',",
+        "  '88902802571733229619176668713819931811048770190271',",
+        "  '25267680276078003013678680992525463401061632866526',",
+        "  '36270218540497705585629946580636237993140746255962',",
+        "  '24074486908231174977792365466257246923322810917141',",
+        "  '91430288197103288597806669760892938638285025333403',",
+        "  '34413065578016127815921815005561868836468420090470',",
+        "  '23053081172816430487623791969842487255036638784583',",
+        "  '11487696932154902810424020138335124462181441773470',",
+        "  '63783299490636259666498587618221225225512486764533',",
+        "  '67720186971698544312419572409913959008952310058822',",
+        "  '95548255300263520781532296796249481641953868218774',",
+        "  '76085327132285723110424803456124867697064507995236',",
+        "  '37774242535411291684276865538926205024910326572967',",
+        "  '23701913275725675285653248258265463092207058596522',",
+        "  '29798860272258331913126375147341994889534765745501',",
+        "  '18495701454879288984856827726077713721403798879715',",
+        "  '38298203783031473527721580348144513491373226651381',",
+        "  '34829543829199918180278916522431027392251122869539',",
+        "  '40957953066405232632538044100059654939159879593635',",
+        "  '29746152185502371307642255121183693803580388584903',",
+        "  '41698116222072977186158236678424689157993532961922',",
+        "  '62467957194401269043877107275048102390895523597457',",
+        "  '23189706772547915061505504953922979530901129967519',",
+        "  '86188088225875314529584099251203829009407770775672',",
+        "  '11306739708304724483816533873502340845647058077308',",
+        "  '82959174767140363198008187129011875491310547126581',",
+        "  '97623331044818386269515456334926366572897563400500',",
+        "  '42846280183517070527831839425882145521227251250327',",
+        "  '55121603546981200581762165212827652751691296897789',",
+        "  '32238195734329339946437501907836945765883352399886',",
+        "  '75506164965184775180738168837861091527357929701337',",
+        "  '62177842752192623401942399639168044983993173312731',",
+        "  '32924185707147349566916674687634660915035914677504',",
+        "  '99518671430235219628894890102423325116913619626622',",
+        "  '73267460800591547471830798392868535206946944540724',",
+        "  '76841822524674417161514036427982273348055556214818',",
+        "  '97142617910342598647204516893989422179826088076852',",
+        "  '87783646182799346313767754307809363333018982642090',",
+        "  '10848802521674670883215120185883543223812876952786',",
+        "  '71329612474782464538636993009049310363619763878039',",
+        "  '62184073572399794223406235393808339651327408011116',",
+        "  '66627891981488087797941876876144230030984490851411',",
+        "  '60661826293682836764744779239180335110989069790714',",
+        "  '85786944089552990653640447425576083659976645795096',",
+        "  '66024396409905389607120198219976047599490197230297',",
+        "  '64913982680032973156037120041377903785566085089252',",
+        "  '16730939319872750275468906903707539413042652315011',",
+        "  '94809377245048795150954100921645863754710598436791',",
+        "  '78639167021187492431995700641917969777599028300699',",
+        "  '15368713711936614952811305876380278410754449733078',",
+        "  '40789923115535562561142322423255033685442488917353',",
+        "  '44889911501440648020369068063960672322193204149535',",
+        "  '41503128880339536053299340368006977710650566631954',",
+        "  '81234880673210146739058568557934581403627822703280',",
+        "  '82616570773948327592232845941706525094512325230608',",
+        "  '22918802058777319719839450180888072429661980811197',",
+        "  '77158542502016545090413245809786882778948721859617',",
+        "  '72107838435069186155435662884062257473692284509516',",
+        "  '20849603980134001723930671666823555245252804609722',",
+        "  '53503534226472524250874054075591789781264330331690'",
+        "];",
+        "",
+        "const testNums = [",
+        "  '37107287533902102798797998220837590246510135740250',",
+        "  '46376937677490009712648124896970078050417018260538'",
+        "];"
+      ],
       "challengeSeed": [
-        "function euler13() {",
+        "function largeSum(arr) {",
         "  // Good luck!",
         "  return true;",
         "}",
         "",
-        "euler13();"
+        "// only change code above this line",
+        "",
+        "const testNums = [",
+        "  '37107287533902102798797998220837590246510135740250',",
+        "  '46376937677490009712648124896970078050417018260538'",
+        "];",
+        "",
+        "largeSum(testNums);"
       ],
       "description": [
         "Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.",