diff --git a/class-14-js-wheresWaldo/bilal-isa/diagonal-difference/index.js b/class-14-js-wheresWaldo/bilal-isa/diagonal-difference/index.js
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+// Partners: Bilal Avvad && Isa Tekinkaya
+
+const arr1 = [
+  [11, 2, 4],
+  [4,  5,  6],
+  [10, 8, -12]
+]; // 15
+
+const arr2 = [
+  [1, 2, 3],
+  [4, 5, 6],
+  [9, 8, 9]
+]; // 2
+
+const arr3 = [
+  [1, 2,  3, 4,  5],
+  [2, 5,  7, 8,  5],
+  [9, 30, 1, 7,  8],
+  [7, 5,  4, 2,  5],
+  [9, 21, 1, 17, 8]
+]; // 11
+
+const diagonalDifference = (array) => {
+  let rightSum = 0, leftSum = 0, leftRight = 0, rightLeft = array.length - 1;
+  for (let i = 0; i < array.length; i++){
+    rightSum += array[leftRight][leftRight];
+    leftRight++;
+
+    leftSum += array[i][rightLeft];
+    rightLeft--;
+  }
+
+  return Math.abs(rightSum - leftSum);
+};
+
+console.log(diagonalDifference(arr1));
+console.log(diagonalDifference(arr2));
+console.log(diagonalDifference(arr3));
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diff --git a/class-14-js-wheresWaldo/bilal-isa/diagonal-difference/readme.md b/class-14-js-wheresWaldo/bilal-isa/diagonal-difference/readme.md
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+## Diagonal Difference
+Given a square matrix, calculate the absolute difference between the sums of its diagonals.
+For example, the square matrix  is shown below:
+
+    1 2 3
+    4 5 6
+    9 8 9  
+
+- The left-to-right diagonal = `1 + 5 + 9 = 15`. 
+- The right to left diagonal = `3 + 5 + 9 + 17`. - Their absolute difference is `|15 - 17| = 2`.
+
+
+### Function description
+Complete the `diagonalDifference` function in the editor.
+- `diagonalDifference` takes two dimensional array of integers as parameter.
+- Returns the absolute diagonal difference
+
+### Example:
+    [[11, 2, 4],
+    [4,  5,  6],       => 15
+    [10, 8, -12]]
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diff --git a/class-14-js-wheresWaldo/bilal-isa/wheres-waldo/index.js b/class-14-js-wheresWaldo/bilal-isa/wheres-waldo/index.js
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+// Partners: Bilal Avvad && Isa Tekinkaya
+
+const arr1 = [
+  ["A", "A", "A"],
+  ["A", "A", "A"],
+  ["A", "B", "A"]
+];
+
+const arr2 = [
+  ["c", "c", "c", "c"],
+  ["c", "c", "c", "d"]
+];
+
+const arr3 = [
+  ["O", "O", "O", "O"],
+  ["O", "O", "O", "O"],
+  ["O", "O", "O", "O"],
+  ["O", "O", "O", "O"],
+  ["P", "O", "O", "O"],
+  ["O", "O", "O", "O"]
+];
+
+const whereIsWaldoTest = (array) => {
+  let location = [];
+  for (let i = 0; i < array.length; i++){
+    for (let j = 0; j < array[i].length; j++){
+      if (j === array[i].length - 1 && array[i][j] !== array[i][0]) {
+        
+        location.push(i+1);
+        location.push(j+1);
+        break;
+      }
+      else if (j !== 0){
+        if(array[i][j] !== array[i][j+1] && array[i][j] !== array[i][j-1]) {
+          location.push(i+1);
+          location.push(j+1);
+          break;
+        }
+      }
+      else if(array[i][j] !== array[i][j+1] && array[i][j] !== array[i][j+2]) {
+        location.push(i+1);
+        location.push(j+1);
+        break;
+      }
+    }
+  }
+  return location;
+};
+
+console.log(whereIsWaldoTest(arr1));
+console.log(whereIsWaldoTest(arr2));
+console.log(whereIsWaldoTest(arr3));
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diff --git a/class-14-js-wheresWaldo/bilal-isa/wheres-waldo/readme.md b/class-14-js-wheresWaldo/bilal-isa/wheres-waldo/readme.md
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+## Where's Waldo?
+ 
+Return the coordinates ([row, col]) of the element that differs from the rest.
+
+### Notes:
+
+- Rows and columns are 1-indexed (not zero-indexed).
+- If you get stuck on a challenge please search it online and try to find resources
+- If you are really stuck, please ask your Instructors.
+
+
+### Examples:
+
+    whereIsWaldo([
+      ["A", "A", "A"],
+      ["A", "A", "A"],
+      ["A", "B", "A"]
+    ]) ➞ [3, 2]
+
+    whereIsWaldo([
+      ["c", "c", "c", "c"],
+      ["c", "c", "c", "d"]
+    ]) ➞ [2, 4]
+
+    whereIsWaldo([
+      ["O", "O", "O", "O"],
+      ["O", "O", "O", "O"],
+      ["O", "O", "O", "O"],
+      ["O", "O", "O", "O"],
+      ["P", "O", "O", "O"],
+      ["O", "O", "O", "O"]
+    ]) ➞ [5, 1]