As someone who once thought mobile games were silly, I was surprised to find myself playing mobile Tetris on the subway, in bed, on line at the post office, and just about everywhere else. I simply could not put it down. With three modes, ranging from marathon mode, which never ends until your Tetris pieces reach the top of the screen, to a three-minute game or a 40-line game, there's always time for a quick—or long—game. You can pause the game at any time, and high scores are saved. The graphics are pretty good, too, and colors are brilliant considering the small screen. Just try to put it down.