Type these codes at the Main Menu…

XCLASSActivate Phantom Class
XTEAMActivate Piranha Team
XTRACKAll Tracks 

Type these codes while the game is paused…

PSYMEGAInfinite Weapons
PSYTICKERInfinite Time
PSYPROTECTInfinite Energy
PSYRAPIDInfinite Machine Gun

Thanks to Revolution readers Christine, Tadej, and Sean Gush!