Niki: Rock 'n' Ball Cheats - Wii
Primary Collection of Cheats
Unlock Bonuses
Credits and 3D gallery - Press and hold D-Pad [Up]+[2]+[-].
Five lives - Hold D-pad [Up]+[2] when Niki appears in the stage.
Invincibility (for 3 minutes) - Press and hold [+]+[B]+[1] in motion control style for 5 seconds, then press [+] to leave the pause screen.