At the 'Main' menu go to 'Options' and select 'Cheats' and enter the following codes to unlock the corresponding effect in the game.

Unlock ALL Cheats:
Press Triangle, Triangle, X, X, Square, Circle, Square, Circle.

Unlock ALL Normal Game Options:
Press Square, Circle, Triangle, Circle, Square, X, Triangle, X.

Unlock Level Select:
Press Circle, Square, X, Triangle, Square, Circle, X, X.

Unlock Super Health:
Press X, X, Square, Triangle, Square, Triangle, Circle.

Unlock Infinite Ammunition:
Press Square, Triangle, X, Circle, Square, Circle, X, Triangle.

Unlock Infinite Grenades:
Press Circle, X, Circle, Square, X, Circle, X, Circle.

Unlock Bouncy Grenades:
Press Circle, Circle, Circle, Circle, Circle, Circle, Circle, Circle.

Unlock Gibby Explosions:
Press Triangle, Circle, X, Square, Triangle, Circle, X, Square.

Unlock Gibby Ammunition:
Press X, X, X, X, Square, Circle, X, X.

Unlock Rapid Rails:
Press Circle, Square, Circle, Square, X, X, Triangle, Triangle.

Unlock Fat Mode:
Press Circle, Circle, Circle, Circle, Triangle, X, Circle, Circle.

Unlock Walking Dead:
Press X, X, X, X, X, X, X, X.

Unlock Wacky Deaths:
Press Square, Square, Square, Square, Square, Square, Square, Square.

Unlock Reign of Fire:
Press Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle.

Unlock Director's Cut:
Press Square, X, Circle, Triangle, Circle, X, Sqaure, Triangle.

Unlock Explosive Personality:
Press X and then 'Use' on someone and they will gib.

Unlock FMV Sequences
When a level has been cleared you will be awarded the FMV sequence for that level plus another movie. Completing Level 1 unlocks a spoof interview with characters from 'Summoner 2'. Completing Level 2 unlocks a behind-the-scenes FMV sequence.

Unlock Joke Message:
Press Square, X, Square, X, Square, X, Square, X.

Unlock All Cheats:
Enter Square, Circle, Triangle, Circle, Square, X, Triangle, X at the Cheat screen.

Unlock Level Select:
Enter Circle, Square, X, Triangle, Square, Circle, X, X at the Cheat screen.

Unlock All Normal Options:
Enter Triangle, Triangle, X, X, Square, Circle, Square, Circle at the Cheat screen.

Super Health:
Enter X, X, Square, Triangle, Square, Triangle, Circle at the Cheat screen.

Unlimited Ammo:
Enter Square, Triangle, X, Circle, Square, Circle, X, Triangle at the Cheat screen.

Unlimited Grenades:
Enter Circle, X, Circle, Square, X, Circle, X, Circle at the Cheat screen.

Unlock Rapid Rails:
Enter Circle, Square, Circle, Square, X, X, Triangle, Triangle at the Cheat screen.

Bouncy Grenades:
Enter Circle, Circle, Circle, Circle, Circle, Circle, Circle, Circle at the Cheat screen.

Gibby Explosions:
Enter Triangle, Circle, X, Square, Triangle, Circle, X, Square at the Cheat screen.

Gibby Bullets:
Enter Circle, Circle, Circle, Circle, Triangle, X, Circle, Circle at the Cheat screen.

Walking Dead:
Enter X, X, X, X, X, X, X, X at the Cheat screen.

Strange Deaths
Enter Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle at the Cheat screen.

Rain of Fire:
Enter Square, Square, Square, Square, Square, Square, Square, Square at the Cheat screen.

Unlock Director's Cut:
Enter Square, X, Circle, Triangle, Circle, X, Square, Triangle at the Cheat screen.

Cheat Mode

Enter Square, Circle, Triangle, Circle, Square, X, Triangle, X as a code at the extras screen to unlock everything.



Alternate Deaths

Enter Square, Square, Square, Square, Square, Square, Square, Square as a code at the extras screen.



Expert Mode

Enter Square, X, Circle, Triangle, Circle, X, Sqaure, Triangle as a code at the extras screen.



Gibby Explosions

Enter Triangle, Circle, X, Square, Triangle, Circle, X, Square as a code at the extras screen.



Infinite Ammo

Enter Square, Triangle, X, Circle, Square, Circle, X, Triangle as a code at the extras screen.



Infinite Grenades

Enter Circle, X, Circle, Square, X, Circle, X, Circle as a code at the extras screen.



Rapid Rails

Enter Circle, Square, Circle, Square, X, X, Triangle, Triangle as a code at the extras screen.



Reign Of Fire Mode

Enter Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle as a code at the extras screen.



Super Health

Enter X, X, Square, Triangle, Square, Triangle, Circle as a code at the extras screen.



Walking Dead

Enter X, X, X, X, X, X, X, X as a code at the extras screen.