diff --git a/ch09-lists-tuples-and-dictionaries/9a-challenge-cats-with-hats b/ch09-lists-tuples-and-dictionaries/9a-challenge-cats-with-hats
new file mode 100644
index 0000000..1f3e7a1
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+++ b/ch09-lists-tuples-and-dictionaries/9a-challenge-cats-with-hats
@@ -0,0 +1,19 @@
+# At the start all cats are hatless.
+cats = [False]*101
+
+# We do a loop over each step size from 1 to 100
+for step_size in range(1, 100 + 1):
+
+ # For each step size we calculate how many cats we are going to visit
+ cats_to_visit = 100 // step_size
+
+ # We only loop over cat indices that are a multiple of our step size
+ for i in range(1, cats_to_visit + 1):
+
+ # We reverse the hat status for each cat we loop over
+ cats[i*step_size] = not cats[i*step_size]
+
+# Print the list of cats that have a hat
+for i in range(101):
+ if cats[i]:
+ print(f"Cat {i} has a hat!")
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