Underground CD Volume 1-2 cheats and cheat codes for Playstation

Show Peak Performance info
At the "Debriefing" or "Download Station" screens of Disc One, hold 
L1 + R1 buttons and press Square, Triangle, O at the "Bulletins" screen 
of Disc One.

Show Mech Warrior 2 info
Quickly press Square, Triangle, O, X.

Show K1: The Arena Fighters info
Hold L1 + L2 and press R1, R2 buttons at the main menu of Disc One. 

Toggle music
Press the Start button at the main menu of Disc One.

Show WCW vs. The World info
Press Square, Square, Triangle, Triangle, O, O at the 
"Tech Q & A" screen of Disc One.

Intelligent Qube preview
Press O, Triangle, Square, Triangle at the "Imports" screen of Disc One.

Watch Twisted Metal 2 picture
Hold Square and press Triangle, Triangle, Triangle, O, O, O 
at the "Download Station" screen of Disc One.

Watch game tester image:
Hold L1 + L2 + R1 + R2 buttons and press Square, O, Triangle, Square at 
the "Research And Development" screen of Disc One.

Blasto preview
Hold Triangle + O and press Square, Square at the "Debriefing" screen 
of Disc One.

View Blasto picture
Press O, Square, Triangle, O at the "Tech Q & A" screen of Disc One.