Shellshock cheats and cheat codes for Playstation

Debug menu (NTSC version)
Press Up, Down, Left, Right, Down, Down, Right, Right, Square on 
your controller when the copyright screen appears.

Debug menu (PAL version)
Press Up, Down, Left, Right, Down, Down, Right, Right, Triangle on 
your controller when the copyright screen appears.

Unlock bonuses
Enable the debug menu, then highlight the credits option and press 
Left(8 times), Triangle.

Unlock Crimson Blade training camp in the Masirah Mountains
Go to the briefing area and find the locker on the left side of the
screen. Open the locker and input "4L2CZCQKDAABACQDB" at the password 
screen to start to play on the bonus mission.

Invincibility
Star to play and then press Start + Select to quit. Then press Up, Up, 
Up, Down, Down, Down, Right, Right, Triangle at the main title screen.
A sound of chime will confirm the correct code entry. If you are low 
on energy, the energy bar will automatically rise during the game play.


Shellshock Game Shark Codes:
               
Invincibile mode
80087C1E 0300
               
Zero Enemy Targets to Kill 
800887D4 0000
               
Upgrade Armor              
800855AC 0004

Upgrade Reloader           
800855BA 0004

Upgrade Coolant            
800855BE 0004

Upgrade Track              
800855B8 0004

Upgrade Engine             
800855B6 0004

Upgrade Target Comp        
800855BC 0004

Unlimited Air Support       
800855B4 0004

Unlimited Cash              
800855C0 FFFF

Unlimited SAMS              
800855AE 0004