If you like tetris, you will like klax and ishizume.
ishizume has the same concept like "klax" of atari games.
You have to make klaxes. a klax is a row (horizontal/vertical/diagonal) of at least 3 stones from the same color in a row. in every wave you have to do a job: make klaxes, horizontals, diagonales, points or survive x stones.