diff --git a/collatz-conjecture/collatz_conjecture.py b/collatz-conjecture/collatz_conjecture.py
index 1740424..49fa1e5 100644
--- a/collatz-conjecture/collatz_conjecture.py
+++ b/collatz-conjecture/collatz_conjecture.py
@@ -1,2 +1,18 @@
 def steps(number):
-    pass
+    if number <= 0:
+        raise ValueError("Please provide a positive integer")
+    else:
+        step = 0
+        if number == 1: 
+            return step
+        else:
+            while number != 1:
+                if number % 2 == 0:
+                    number  = number / 2
+                    step += 1
+                else: 
+                    number  = 3 * number + 1
+                    step += 1
+            return step
+
+            
diff --git a/darts/darts.py b/darts/darts.py
index 4ba1b3b..e35ad8c 100644
--- a/darts/darts.py
+++ b/darts/darts.py
@@ -1,2 +1,15 @@
+OUTER_RADIUS = 10
+MIDDLE_RADIUS = 5
+INNER_RADIUS = 1
+
 def score(x, y):
-    pass
+    distance_squared = x**2 + y**2
+
+    if distance_squared <= INNER_RADIUS**2:
+        return 10
+    elif distance_squared <= MIDDLE_RADIUS**2:
+        return 5
+    elif distance_squared <= OUTER_RADIUS**2:
+        return 1
+    else:
+        return 0