Player Costume Change
     At  the  Character  Select  screen,  press  Square + Triangle for
Costume 1 or X + Circle for Costume 2.

Play as Devil Kazuya
     Beat all the rounds of Galaxian.

Play as Heihachi
     Beat the entire game without continuing.

Play as Sub-Boss
     Beat the Sub-Boss and he'll be available.

Play Galaga with Two Ships
     During  Power-Up,  hold  Up + L1 + Triangle + X on the player two
controller.
- or -
     Press  Select,  and  before  Galaga  round,  hold Up + Triangle +
Square + R1 until the round starts.