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Playstation - Underground CD Volume 1-3 cheats

Watch PSX second birthday movie:
Push Triangle, Circle, Square at the "Event Center" screen of Disc 1.

Show Machine Hunter info:
Push Square, Triangle, Circle Square at the "Event Center" screen of Disc 1.

Watch Helene Sheeler
Hold Square + Circle and push Triangle, Triangle buttons 
at the "Code Archive" screen of Disc 2

Watch Crash Bandicoot 2 preview
Push Circle, Triangle, Square, Circle at the main menu of Disc 2.

Watch Apollo 440 movie:
Push Triangle, Circle, Triangle, Triangle, Square at the main menu 
of Disc 2.

Watch Blasto preview
Push L1 + L2 + R1 + R2 buttons at the main menu of Disc 2.

Watch Spawn preview
Push Triangle, Circle, Triangle, Circle at the main menu of Disc 2.

Toggle music
Press Start at the main menu of Disc 2.

Fighting Force Game Shark Codes:
                
Unlimited Rocket Launcher 
80066942 0004
                
Unlimited Gun             
80066946 0010

Unlimited Health          
80096060 017C