 It was accompanied by a handheld game for the Game Boy Color, released shortly afterwards.Both games feature a compatibility mode that allows certain gameplay options within the Nintendo 64 game to alternatively be unlocked via a Transfer Pak.A "sister" game to the Nintendo 64 title, entitled "Velvet Dark", was initially planned to be developed for either the Nintendo 64 or GameCube in late 2000, but the project was ultimately abandoned.