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.
Debug Mode: 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
Select Difficulty: 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
Sound Test: 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
