jg-gambatte (Nintendo Game Boy emulation core for Jolly Good Emulation) Gambatte JG is an emulator for the Nintendo Game Boy/Game Boy Color. This is a fork of the final public revision of Gambatte. Filenames supported: .gb .gbc To run files with other extensions: jollygood -c gambatte By default, no controls are mapped. The first time you run a game, press Shift-1 to configure the first controller.