Underground CD Volume 4.1 Codes -

Toggle music:
Press R1 + R2 + Start at the main menu of Disc 1.

View Grand Theft Auto 2 codes:
Press R1 + R2 + L1 + L2 at the main menu of Disc 1.

View Sled Storm codes:
Quickly press [L1 + L2, R1 + R2] repeatedly at the main menu of Disc 1.

View WCW Mayhem codes:
Hold L1 + L2 + X at the main menu of Disc 2.

View GameDay 2000 codes:
Quickly press [R1 + R2, L1 + L2] repeatedly at the main menu of Disc 2.

View NBA Shootout 2000 information:
Press L2, R2, L2, R2, L2 at the "Bulletins" screen of Disc 1.

View Knockout Kings 2000 information:
Press L2, R2, R1(2) at the "Cool Moves" screen of Disc 1.

View You Don't Know Jack information:
Press L1, L2(2), R2 at the main menu of Disc 2.

View Syphon Filter 2 hints:
Enter the following Security Codes.

1: L2
2: Triangle
3: L1
4: R1
5: Square
6: R2
7: X
8: Circle