Prophecy Cheat Codes
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During gameplay hold down SHIFT and type in these codes: 

During spaceflight:
CTRL+I - Invulnerability
CTRL+K - Suicide
CTRL+C - No collision mode
GOODTARGET - Turret targeting mode
DYNOMITE - Debug mode
CTRL- F12 1 - Sheilds disappear on targeted ship
MORETUNES - Radio on

At the simulator mission select screen:
ALSWANTSMORESHIPS - Fly enemy ships