Beatmania GB2 Gatchamix review. Shop CGR shirts & mugs! Classic Game Room presents a CGR Undertow video review of Beatmania GB2 Gatchamix for Game Boy Color, developed and published by Konami. Beatmania GB2 Gatchamix is a collection of tracks from previous Beatmania titles, all compiled onto one Game Boy Color cart. The good part of this is that it's a collection of awesome tracks. The bad part is that it attempts to adapt a fairly resource-intensive Arcade and PS1 game to the Game Boy Color. Thus, the parts that make it through are entertaining, but it takes quite a lot to get through to it. This video review features video gameplay footage of Beatmania GB2 Gatchamix for GBC and audio commentary from Classic Game Room's TJ.