Underground CD Volume 3.4 Codes -

View Suikoden 2 information:
Press R2(2), L1(2) at the "Behind The Scenes" screen of Disc 1.

View Trick n' Snowboarder information:
Press L1, L2, L1, R1(2) at the main menu of Disc 1.

View Croc 2 information:
Press R1(2), L2, R1, R2, L2 at the main menu of Disc 2.

Hint: WCW Mayhem demo:
While in the ring against Sting, there will be a run-in all the time. You can make him leave by getting back up against the ropes and tie-up by pressing Square. To do the Irish Whip press R1 + D-pad, depending on where your back is facing. If your back is towards the bottom you would have to push Down. He will leave and will not come back out until you play demo again.