While you are loading your playstation hold up,L1,triangle, and square on controller 2 until the begining of the galaga game.

Result: Double ships on Galaga game

Score a perfect "40" on all eight waves of the galaga game without using any continues and you can't use the above code either.

Result: To play as Devil Kazuya

Beat the game with any character.

Result: Get that characters sub-boss.

Beat the game without using any continues.

Result: Get the boss, Heihachi