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Retroboy

A Game Boy/Game Boy Color emulator with input, graphics and save data. Attach one of the three included cartridges to the console to start a game.

REQUIRES NETWORK to download games.

Keyboard input works as well as the buttons on the gadget. The bindings are as follows:
Up/Down/Left/Right: Arrow keys
A button: Z
B button: X
Select: A
Start: S

If you have a slow computer, I recommend disabling ambient lighting (the A switch at the bottom)

Uses a modified version of LuaGB.