diff --git a/csharp-fundamentals-loops.Main/Core.cs b/csharp-fundamentals-loops.Main/Core.cs
index 9194643..3d233df 100644
--- a/csharp-fundamentals-loops.Main/Core.cs
+++ b/csharp-fundamentals-loops.Main/Core.cs
@@ -20,32 +20,62 @@ public class Core
         public void stepOne()
         {
             // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array                        
-            throw new NotImplementedException();            
+            for (int i = 0; i < numsZeroToThree.Length; i++)
+            {
+                numsZeroToThree[i] = i;
+            }            
         }
 
         public void stepTwo()
         {
             // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
-            throw new NotImplementedException();
+            for (int i = 0; i < numsFiveToTen.Length; i++)
+            {
+                numsFiveToTen[i] = i + 5;
+            }
         }
 
         public void stepThree()
         {
             // TODO: 3. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
-            throw new NotImplementedException();
+            for (int i = 3; i >= 0; i--)
+            {
+                countdown[-(i-3)] = i;  // 3, 2, 1, 0 -> 3-3=0, 2-3 = -1...
+            }
 
         }
 
         public bool stepFour(int num)
         {
             // TODO: 6. Write a for loop that checks if num is in the favouriteNumbers array            
-            throw new NotImplementedException();
+            
+            for (int i = 0; i < favouriteNumbers.Length; i++)
+            {
+                int val = favouriteNumbers[i];
+
+                if(val == num)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+
         }
 
         public bool stepFive(string hobby)
         {
             // TODO 5. Write a for loop that checks if the hobby String is in the myHobbies array
-            throw new NotImplementedException();
+            for (int i = 0; i < myHobbies.Length; i++)
+            {
+                string hb = myHobbies[i];
+
+                if(hb == hobby)
+                {
+                    return true;
+                }
+            }
+            return false;
         }
     }