Underground CD Volume 4 - Issue 2 Game System: Sony Playstation Cheat Category: Cheat Game Company: Unknown Game Category: Unknown Hint, Cheat, Walkthrough:   Underground CD Volume 4 - Issue 2 ================================= (submitted by: regginoy) UNLOCK METAL GEAR SOLID 2: SONS OF LIBERTY TRAILER: Go to the Security Code screen and press L1, L2, X, R2, R1, Triangle, Circle, Square. The movie will start playing.