Small Head: Start a game and at the character select screen, pick a fighter and then immediately simultenaously press and hold Left, Start, Circle, and Square until the match starts. When the match starts, your character will have a small head.
Play as Bilstein: Start a game in "Arcade Mode." Then, at the "Character Select" screen, press and hold Select, put the cursor on Gore, and press X, Circle, X, Circle, Square, Square, Square, Triangle, Triangle, Triangle, simultaneously press X and Circle. Bilstein appears. Move the cursor to the right of Gore, and you can play as Bilstein.
Play as Kappah: Note: You must first enter the code to play as Bilstein.
Start a game in "Arcade Mode." Then, at the "Character Select" screen, press and hold Select, put the cursor on Hayato, and press Circle, Square, Triangle, Square, X, Square, Triangle, Square, Circle, Square, simultaneously press X and Triangle. Kappah appears. Move the cursor to the left of Hayato, and you can play as Kappah.
Play as Blood: Note: you must have entered the codes to play as Bilstein and Kappa to do this trick. Start a game in Arcade Mode. Then, at the Character Select screen, press and hold Select, put the cursor on Bilstein and press X, Square, X, Square, X, Square. Then move the cursor on Kappah and press Circle, Triangle, Circle, Triangle, Circle, Triangle, simultaneously press L1 and R1. Now you can play as the boss character Blood.
Dark Mode: At the vs screen, press and hold L2, R2, and Down until the fight starts.