Gurumin 3D: A Monstrous Adventure Cheats

Japanese voice
To unlock original Japanese voice, clear game under any difficulty, start new game, while on the difficulty select screen, hold down the L and R buttons and enter: Left, Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down. A sound will play if the code is entered correctly. (Thanks to Jeduthy, for the info).
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