Enable Sound Test cheat. Press I, II, than keep pressing Select until the debug screen appears. You can now do the following:
Code Effect 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 Extra Lives, Bombs, Power Enter 83 Half Game with lots of Satellites Enter 77. Press Up, Down before leaving debug screen. Invincibility Enter 00 (level 0) - 09 (level 9) Level Select
After selecting your mode, press Run and Select simultaneously to reset the game.
Code Effect Place I and II on top turbo speed and hold down I, II and Select simultaneously ''Normal Dog'' or ''Hard Human'' difficulty Place I and II on low turbo speed and hold down I, II and Select simultaneously ''Super Mania'' or ''God of the Game'' difficulty
Contributed By: Colin.
Hold Select and alternately press Left and Right repeatedly until 'Sound 01' appears.
Code Effect At the title screen, hold Select and press Run until the phrase 'Area 1' appears. 30 Continues Enable the Sound Test cheat. Press I, II, Select 22 times. Then hold Select and Run until the game starts. Area 0, 30 continues Hold Select and alternately press Left and Right repeatedly until 'Sound 01' appears. Sound Test Hold Right, and keep pressing Run quickly at the title screen. View Ending
16 Lives, 36 Bombs and Double Score
Don't shoot any bosses who are on odd numbered levels (1,3,5 etc). You will receive the lives, bombs and score when the boss leaves.
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