Puyo Puyo

Puyo Biology 101: Puyos are little blobs of jelly that come in red, yellow, blue, green, and purple varieties. Naturally attracted to each other, Puyos will attach themselves together when placed beside another Puyo of the same color. Your job is to arrange them into groups of four or more so that they will evaporate. You lose when the pile of Puyos reaches the top of the screen.