I now have 171 stamps. Some of them were very hard to get, yet they were very fun and challenging. I think the hardest was finding Rock Hopper. It took me days to track that cunning penguin down. Another one I had trouble with was getting the Astro Master stamp in Astro barrier. Those expert levels were very hard to get through. I will eventually get them all....that is my goal. I just love Club Penguin.