Hold Select, press Run at the title screen, and wait until the phrase "Area 1" appears.
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Unlimited continue
Enable the "30 continues" code. When the current game ends with 30 continues remaining, press Select, Select, then hold Select + Run until the game restarts.
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Mode select
Hold Select while tapping I, II repeatedly at the title screen. Press Select to choose between four difficulty levels. Begin game play by holding Run and press Select. Alternatively, enable the Turbo switches and press I + II to start the first part of the code.
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Area 0, 30 continues
Enable the "Sound test" code. Press I, II, Select twenty two times. Then, hold Select + Run until gameplay begins.
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Passwords
Level select
Enter 00 - 09 as a debug number.
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Invincibility
Enter 77 as a debug number, then press Up, Down before exiting the debug screen.
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Half game with many satellites
Enter 83 as a debug number.
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Unlockables
Sound test
Hold Select and alternately tap Left, Right repeatedly until "Sound 01" appears.
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Debug mode
Enable the "Sound test" code. Press I, II then tap Select repeatedly until the debug screen appears. The following debug functions may now be enabled.
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Hints, Tips & Tricks
16 lives, 36 bombs
Avoid and do not shoot the Boss at the end of any odd numbered level. After the Boss leaves, 16 lives, 36 bombs, and a double score will be awarded.
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Secrets
View ending sequence
Hold Right and quickly tap Run at the title screen.
