diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-countdown.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-countdown.md
index 7d2db2f3971..36dd7bcbf98 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-countdown.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-countdown.md
@@ -71,6 +71,13 @@ assert(
 );
 ```
 
+Global variables should not be used to cache the array.
+
+```js
+countdown(1)
+assert.deepStrictEqual(countdown(5), [5, 4, 3, 2, 1]);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-range-of-numbers.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-range-of-numbers.md
index 1d4b36878db..c1d664f2baf 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-range-of-numbers.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-recursion-to-create-a-range-of-numbers.md
@@ -56,6 +56,13 @@ assert.deepStrictEqual(rangeOfNumbers(6, 9), [6, 7, 8, 9]);
 assert.deepStrictEqual(rangeOfNumbers(4, 4), [4]);
 ```
 
+Global variables should not be used to cache the array.
+
+```js
+rangeOfNumbers(1, 3)
+assert.deepStrictEqual(rangeOfNumbers(6, 9), [6, 7, 8, 9]);
+```
+
 # --seed--
 
 ## --seed-contents--
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.md
index 478b241b8bd..e0538763619 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.md
@@ -42,6 +42,13 @@ Your solution should not use the `Array.prototype.flat()` or `Array.prototype.fl
 assert(!code.match(/\.\s*flat\s*\(/) && !code.match(/\.\s*flatMap\s*\(/));
 ```
 
+Global variables should not be used.
+
+```js
+steamrollArray([1, {}, [3, [[4]]]])
+assert.deepEqual(steamrollArray([1, {}, [3, [[4]]]]), [1, {}, 3, 4])
+```
+
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 ## --seed-contents--