Additional characters:
At the character selection screen hold R1, R2, L1, or L2 .


Level Select:
Press at the title screen Up, Up, Up, Down, Down, Down, Up, Down, Down, Down, L1, R1


Big Heads:
Press at the title screen Up, Up, Up, Down, Down, Down, Left, Right, Right, Right, L1, R1 .


Another arcade mode:
Win 36 licenses in arcade mode. When this is done, press Circle at the stage selection.