Unlike previous beatmania games (beatmania GB and beatmania GB2 ガッチャミックス) for the Game Boy, beatmania GB ガッチャミックス2 is compatible only with Game Boy Color systems. Also unlike the other two Game Boy releases, beatmania GB ガッチャミックス2 contains no KONAMI original songs. Only Game Boy beatmania game with Double charts, known as DUET. Two players play a chart together. You need a Game Boy link cable, two Game Boy Colors, and both players need copies of the game to play this mode. Only 8 songs have DUET charts. Just like in VERSUS mode, an EXPERT gauge (starts at 100% with no recovery during the song) is used for each song. However, in DUET mode, the song can only end prematurely when both players deplete their gauge. None of the songs have artists listed. A password system is used to unlock songs to become playable in FREE mode. Total songs: 25