Head for the code menu and input these cheats

• Level Warp - Y, WHITE, BLACK, L, A, R, R, Y
• God Mode - Y, A, B, X, B, A, A, L
• Invincibility - X, X, X, R, A, L, L, Y
• Infinite Ammo - A, L, L, BLACK, B, WHITE, L, L
• Restore Health - X, R, A, Y, BLACK, B, A, R
• Restore Ammo - BLACK, B, A, R, R, A, L, BLACK
• View Movies - A, Y, A, Y, BLACK, R, A, Y
• Big Head Mode - L, BLACK, B, WHITE, WHITE, B, BLACK, L
• Big Hand Mode - R, WHITE, X, L, WHITE, R, R, Y
• Big Feet Mode - R, WHITE, Y, A, L, B, WHITE, X
• Topsy Turvy Mode - Y, A, B, B, A, B, WHITE, WHITE