Programming Challenge

Hi guys, i want to challenge my logic thinking by creating hard program, can you give me a sample of hard program? and include the details, i already finish diamond, string fibonacci..etc..Thanks
Make a tetris clone. It touches a lot of common game logic problems in a way that isn't overwhelming.
I am using console only..
You could make a BST (Binary Search Tree) though it's a pretty trivial task. http://en.wikipedia.org/wiki/Binary_search_tree

Or if you want more of a math/programming/algorithm challenge you could do some of these http://projecteuler.net/problems
thanks..
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