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.
- E'fighter HOT
- Garou: Mark of the Wolves
- Dragonball fighting game (only the hack "Dragonball Fight 2005" dumped, real name unknown)
- In the regular GameBoy mode, the HUD part of the screen seems to be glitched.