Xpuyopuyo is a Tetris-like puzzle game where you strive to match up four "blobs" of the same color. Each match gives you points, and also dumps gray rocks on your opponent which are irritating and troublesome to get rid of. Multiple matches at one time score more points, and result in more rocks being dumped on the opponent (much to their dismay). First person to fill up their screen with puyopuyo blobs loses.