The King of Fighters R-2 engine is a fighting game engine used in Game Boy Color games published by SKOB and Fiver Firm. Text that appears to reference a Gamtec development tool appears in three of these games, but it is unknown whether Gamtec actually developed these games itself or supplied the tools to another company. It may be related to the Takara King of Fighters engine but, if so, it is more heavily modified than the version used by Vast Fame.