Killzone - Liberation cheats and cheat codes for Sony PSP

Unlock abilities:

Complete different challenges and reach the indicated number of points
to unlock new abilites. Press Square at the weapon selection screen 
to select an ability.

Earn 20 points - Carry 3 grenades
Earn 60 points - Carry 3 syringes
Earn 100 points - Faster C4 Placement
Earn 140 points - Carry 3 smoke grenades
Earn 180 points - Faster Trip mine disarm
Earn 220 points - Carry 5 pressure mines
Earn 260 points - Double close combat damage
Earn 300 points - 50% more health
Earn 340 points - Your partner has 50% more health
Earn 480 points - Unlimited ammunition

Unlock Bonuses:

Unlock Concept art pack #1: 
Finish campaign 3-4 in single player mode on the normal difficulty level.

Unlock In-depth character profiles #1: 
Finish campaign 1-1 in single player mode on the easy difficulty level.

Unlock In-depth character profiles #4: 
Finish campaign 4-4 in single player mode on the easy difficulty level.

Unlock Jukebox: 
Finish campaign 2-4 in single player mode on the normal difficulty level.

Unlock Multi-player Character Cobar: 
Finish campaign 4-4 in single player mode on the hard difficulty level.

Unlock Multi-player Character Evelyn: 
Finish campaign 4-4 in single player mode on the normal difficulty level.

Unlock Wallpaper pack #1: 
Finish campaign 1-4 in single player mode on the easy difficulty level. 


Unlock bonus characters:

Unlock Commando: 
Beat two player co-op mode.

Unlock Cobar: 
Beat the game on the hard difficulty level.

Unlock Specialist: 
Win 10 games in Ad-Hoc or Infrastructure Multi-player mode.

Unlock Stratson: 
Win 100 games in Ad-Hoc or Infrastructure Multi-player mode. 

Unlock Metrac: 
Beat the game on the easy, normal, and hard difficulty levels.