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Smash Hero
Sounds something like Pokemon Puzzle League.It's not really Tetris, if you watch you connect three in a row of the same shape or more, and you can move them AFTER they've landed, plus when you get enough blocks cleared, it sends a gigantic block to the opponent's screen. Basically, you're attacking with blocks that fall like in Tetris, hence the name Tetris Attack. It's even more fun when you go against someone else.