The Game Boy version of Side Pocket is significantly different from the NES version, featuring a smaller playing field (to compensate with Game Boy's screen), simplified physics and a different screen layout. Like in NES version, the Pocket Game mode features 4 levels and the player starts with 5 lives. One unique addition to the Game Boy version is the ability to play single-player nine-ball mode, while in other versions this mode is limited only to two players.