Enable Sound Test cheat. Press I, II, than keep pressing Select until the debug screen appears. You can now do the following:
Effect Code Extra Lives, Bombs, Power Use level select to go onto which level you want, then hold I and II and press Start to begin gampleay with 10 lives and 10 bomb Half Game with lots of Satellites Enter 83 Invincibility Enter 77. Press Up, Down before leaving debug screen. Level Select Enter 00 (level 0) - 09 (level 9)
After selecting your mode, press Run and Select simultaneously to reset the game.
Effect Code ''Normal Dog'' or ''Hard Human'' difficulty Place I and II on top turbo speed and hold down I, II and Select simultaneously ''Super Mania'' or ''God of the Game'' difficulty Place I and II on low turbo speed and hold down I, II and Select simultaneously
Contributed By: Colin.
Hold Select and alternately press Left and Right repeatedly until 'Sound 01' appears.
Effect Code 30 Continues At the title screen, hold Select and press Run until the phrase 'Area 1' appears. Area 0, 30 continues Enable the Sound Test cheat. Press I, II, Select 22 times. Then hold Select and Run until the game starts. Sound Test Hold Select and alternately press Left and Right repeatedly until 'Sound 01' appears. View Ending Hold Right, and keep pressing Run quickly at the title screen.
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