Full Inventory
Get all of the weapons, both blue and yellow keys, 999 ammo, and full energy by pressing 4, 9, 9, 6 while playing.
God Mode
For invincibility, press 4, 6, 6, 8 while playing.
Level Select
For access to any level or mission, hold 1 + 3 + 7 + 9 at the main menu.
Level Skip
To advance a level while playing, press 4, 7, 8, 6. To retreat a level, press 4, 6, 9, 6.
Music Test
Press # while the ID/Atari ball is spinning.
Refresh Info
To access a weird debug mode, press 4, 8, 8, 7 while playing.
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