Gregory Cannon like’s Tetris. He recently wrote an AI that plays NES Tetris extremely well. It’s not perfect as it uses a search & heuristic approach, but boy can it play some Tetris.

Source code here: https://github.com/GregoryCannon/StackRabbit

He also wrote a Tetris trainer that lets you draw a particular Tetris board layout and then get an AI recommendation about the best play.