This is the Reference of the Gamebuino Meta. If you have an older Gamebuino, head to the Legacy Reference.
You can download the PDF version
Buttons names:
BUTTON_A
BUTTON_B
BUTTON_MENU (used to be BUTTON_C)
BUTTON_UP
BUTTON_RIGHT
BUTTON_DOWN
BUTTON_LEFT
All these function should not be used as they are internal and might change with no backward compatibility. Use at your own risk.