At the Fighting Force screen, press Triangle, Circle, Square.
At the NFL Gameday '98 screen, press Square, Triangle, Circle.
At the Intelligent Qube screen, press Circle(2), Triangle.
At the Nightmare Creatures screen, press Square, Triangle, Square. Game Shark Codes
At the Nightmare Creatures screen, press Square, Triangle, Square.
Game Shark Codes
At the Colony Wars screen, press Square, Circle, Triangle.