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Invincibility
Enter 77 as a debug number, then press Up, Down before exiting the
debug screen.
Sound test:
Hold Select and alternately tap Left, Right repeatedly until "Sound 01"
appears.
Area 0, 30 continues:
Enable the "Sound test" code. Press I, II, Select twenty two times.
Then, hold Select + Run until gameplay begins.
View ending sequence:
Hold Right and quickly tap Run at the title screen.
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.
Level select
Enter 00 - 09 as a debug number.
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.
30 continues:
Hold Select, press Run at the title screen, and wait until the
phrase "Area 1" appears.
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.
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.
Half game with many satellites
Enter 83 as a debug number.
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