Enter the following cheats at the Title screen. When a cheat has been activated there will be an '!' at the top left hand corner of the screen. Enter in the cheat again to turn it off. Load your Profile to go into the game and save to make it permanent.

Unlock Free Mode:
L1, R1, Left, Left, Left, Left, Left, Left, L2, up, Triangle, Triangle, Right

Unlock ALL Weapons:
L1, R1, X, X, Triangle, R1, R1, Triangle, Square, X, R1

Unlock Bonus Weapon in Multi-Player Mode:
L2, L2, x, x, Triangle, R1, R1, Square, R1

Unlock Circle Challenge Mode:
L2, R2, Triangle, Right, Left, Up, Up, Left, R2, R2 ,R2,

Unlock Two Players in Story and Free Modes:
L1, R2, Circle, Circle, Triangle, L2, R1, Circle, Triangle, circle

Unlock ALL Characters:
R1, R2, X, Left, Right, Square, Square, Square, Square, L1, Square, Triangle, O

Unlock Free Mode:
Beat the game

Unlock Challenge Mode:
Beat the Game

Unlock Marshall Law:
Beat One Stage Of 'Free' mode

Paul Phoenix:
Beat The 'Challenge' mode

Play as Kelly:
Beat Chapter 1 on 'Free' mode with 'B Rank' or above in all missions.

Play as Vera Ross:
Beat Chapter 1 on 'Free' mode with 'B Rank' or above in all missions.

Play as Lilian:
Beat chapter 1 on 'Free' mode with 'B Rank' or above in all missions. Play as Napalm99:
Beat Chapter 2 on 'Free' mode with 'B Rank' or above in all missions.

Play as McKinzie:
Beat Chapter 2 on 'Free' mode with 'B Rank' or above in all missions.

Play as Golem:
Beat Chapter 3 on 'Free' mode with 'B Rank' or above in all missions.

Play as Ling Fong:
Beat Chapter 3 on 'Free' mode with 'B Rank' or above in all missions.

Play as Bordin:
Beat all Chapters on 'Free' mode with 'S Rank' in all missions.

Play as Shinkai:
Beat all Chapters on 'Free' mode with 'A Rank' in all missions.


Fighting groups and characters for Multiplayer Mode

Westside Gym, Zaps and KG:
Beat mission 30 in 'Story' mode.

Chris:
Beat mission 46 in 'Story' mode.

Park:
Beat mission 60 in 'Story' mode.

Alex:
Beat mission 67 in 'Story' mode.

Shadow Platoon, Outlaws, Bain & Cooper:
Beat mission 70 in 'Story' mode.

Tin Jiao and Mushin-Kai:
Beat mission 99 in 'Story' mode.