Level Select and Sound Test
Enter the code at the "A Probe Development" screen. A sound effect will play if the code was entered correctly. The level select menu will appear when starting a new game. The MUSIC / SFX option is added to the main menu after the title screen.
Effect Code Level Select and Sound Test B, A, down, left, A, down, A, B, C
Contributed By: FFCrono.
Before the final password
Enter password PSTRVJZ
Contributed By: Desert eagle.
Enter the following codes at the password screen...
Aspen Penal Colony
Then when you enter the codes you should go strait to the level you entered.
Contributed By: Mike Truitt.
Password to Invasion by Gila Munja
Insert code: HQWVLT
Contributed By: steamliner88.
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