Game, in general, Tetris. Between the 20 different versions I've played I've spent a plain stupid amount of time playing that game. I've spent more time than I even spent playing FFXI and I played that game for well more thna five years. I've been playing Tetris for more than 20 years and loving every minute. I can easily start playing for what I assume will be no more than 15 minutes and then all of a sudden it's three in the morning and five hours later.
If I don't count all the different versions of Tetris together, it's still probably Tetris. Probably Tetris for the Game Boy (through the Game Boy itself and emulators) or Tetris DS. I've spent a ridiculous amount of time on both.








