Pause the game, hold L + R, then press the following button combos to unlock the corresponding code:

Cheat Code	Code
Restore Health	Y, Down, A, Up
Restore Ammo	A, Down, Y, Up
Gain 1,000 Experience Points	A, Down, Down, Down
Level 2 Skills	X, Right, X, Right
Level 4 Skills	Y, Up, Y, Up
Level 6 Skills	B, Left, B, Left
Level 8 Skills	A, A, Down, Down
Invincibility	Y, B, A, X
Unlimited Missile Weapons	B, X, A, Y
Devastating Attacks	B, B, X, X
Upgrade All Combos	Y, X, Y, X
Smaller Enemies	Y, Y, A, A
Slow Motion Mode	Y, X, A, B

Unlock The Tower of Orthanc Level

Beat the game with any character at Level 10.

Unlock Fangorn and Tower of Orthanc Background Pictures

Beat the Fangorn's Forest Level with any character.

Unlock Rohan and Helm's Deep Background Pictures

Beat the Plains of Rohan Level with any character.

Unlock Fellowship of the Ring Background Pictures

Beat the Balin's Tomb Level with any character.

Unlock John Rhys-David Interview

Playing as Gimli, get him to Level 5.

Unlock Orlando Bloom Interview

Playing as Legolas, get him to Level 5.

Unlock Viggo Mortenson Interview

Playing as Aragorn, get him to Level 5.