All Kinds of Cheats

Mechwarrior 2 Codes: Hold Square, Triangle, Circle and press X at the Main Menu
Intelligent Qube: Press Square, Triangle, and Circle at the same time in Imports
K-1 The Arena Fighters Moves: Hold L1, R1, L2, R2 at the Main Menu
Twisted Metal 2 Fan: Hold L1, R1, L2, R2, Triangle, Circle  and press Square in Download Station
Bruce @ 4:00 a.m.: Hold L1, R1 and press Square, Triangle , Circle at the same time in Research & Development
Blasto: Press Triangle, Circle, Square, Triangle in Debriefing
Blasto Still: Press Square, Triangle, Circle at the same time  in Tech Q&A
Peak Performance Code: Hold L1, R1, Square, Triangle, and Circle at the same time in Bulletin
WCW Vs. the World Moves: Press Square, Square, Triangle, Triangle, Circle, Circle in Tech Q&A