First Person View:
After getting every fighter, hold L1 & L2 while selecting a character.

Big Head Mode:
Complete the game to unlock all the characters. Then hold while choosing character.

Win Without Fighting:
Highlight 'Option' mode. Then press and hold R1. Now Press Circle, Circle, Triangle, X, X, Circle, and Triangle. This code will only work in single player mode.

Wire Frame Mode:
To get wire frame mode you must have all 26 characters, now hold L2 and R2 while choosing your character.

Devil and Kazuya:
To get Devil and Kazuya, get all 26 characters then beat the Devil with a secret character and then you have Kazuya. To get the Devil you must beat the game with Kazuya.

All Characters:
on arcade mode choose your best character and fight with him to round nine or start of ten then lose and pick one that you have not completed with then you will have his special character (you can do this with all characters except when you want roger).