Daiku no Gen-San: Robot Teikoku no Yabou (Gameboy)
CheatingDome.com
Cheat Mode
At the title screen, press Up, A, Down, B, Left, Right, Left, Right, B, A - a sound will confirm correct code entry. This will permit a number of options.
At the title screen, press and hold Start, until the "PUSH START" stops fading in and out. Then press B up to 13 times, equal to the stage/sub-stage number. Release Start to begin from the stage.
During gameplay, press and hold Start. While holding it, enter one of the following code sequences for an effect: Right, Left, Right, Left, Down, Down, Up, Up, A, B will give you a life refill. Up, Down, Up, Down will give you a game over.