Underground CD Volume 1-4 Cheats (PlayStation)

At the "Vault" screen of Disc 2, press Circle, Triangle, Circle, Square, Circle.

At the "Vault" screen of Disc 2, hold Triangle + Circle and press Square(2).

At the "Event Center" screen of Disc 1, hold Triangle + Circle and rapidly tap Square.

At the "Vault" screen of Disc 2, press Triangle, Square, Triangle, Square, Triangle.

At the "Vault" screen of Disc 2, press R2.

Game Shark Codes

At the "Vault" screen of Disc 2, press Square, Triangle, Square, Circle.

At the "Bulletin Board" screen of Disc 1, hold Triangle + Circle and rapidly tap Square.

At the "Code Archive" screen of Disc 1, press Square, Circle, Square, Triangle.