Tumblestone

Tumblestone is a competitive multiplayer puzzle game that plays similar to Tetris crossed with Bejeweled.

Destroy the blocks in sequences of exactly three at a time. If you shoot a block out of sequence, a row will get added to your board, but if you create a sequence of three same-colored blocks, a row gets added to your opponent's board. Just don't let the blocks fall to the bottom of your board...the last player standing wins!