Start game as usual - go to the BRIEFING SCREEN (where you can select 
"START MISSION" and "BUY STUFF") and press the TAB key to bring up the
cheat codes menu and enter following codes using the CURSOR KEYS, or  
gamepad if assigned - where L stands for LEFT, R for RIGHT, U for UP  
and D for DOWN (e.g. RDRL = RIGHT,DOWN,RIGHT,LEFT).                   
ESC closes the cheat menu when youre done.                            
                                                                      
LULRD          - All Movies Unlocked                                  
RDRL           - Get all Weapons                                      
RLLDU          - Add +50000 Arconium                                  
RULRU          - Unlock All Levels                                    
RDRDR          - Unlimited Shields                                    
UDDRDU         - Unlimited Secondary Ammo