During play, pause the game, hold L + R and enter the following codes:

Infinite Missile Weapons:
X, X, Down, B.

Play as Faramir:
A , A, Y, Y.

Aragorn 1,000 XP:
Up, X, Y, A.

Aragorn level 8 skills:
Up, X, Y, Up

Gandalf 1,000 XP:
B, Y, Up, Down.

Gandalf level 8 skills:
B, X, Down, Down.

Frodo 1,000 XP:
Up, Y, Up, Down.

Frodo level 8 skills:
B, B, Down, Down.

Sam 1,000 XP:
Y, A, Down, A.

Sam level 8 skills:
B, B, Y, Y.

Legolas 1,000 XP:
A, Y, Up, A.

Legolas level 8 skills:
X, Up, Up, Down.

Gimli 1,000 XP:
B, B, Y, A.

Gimli level 8 skills:
A, B, Down, X.

The following codes will only work after you have beaten the game once.

During play, pause the game, hold L + R and enter the following codes:

Play as Frodo:
B, X, X, A.

Play as Merry:
A, Down, Down, A.

Play as Pippin:
Y, B, X, Down.

Invincibility:
X, B, X, Up.

Full Health:
X, X, B, B.

Perfect Mode:
B, Down, Y, A.

All Attack Upgrades:
Up, Down, Y, X.

Always Devastating:
Y, Up, Y, Down.

Target:
Down, B, Up, X.

Aragorn 4-Hit Combo:
Up, X, Y, Down.

Gandalf 4-Hit Combo:
Down, Y, Up, B.

Legolas 4-Hit Combo:
A, B, Y, X.

Gimli 4-Hit Combo:
Y, X, Up, A.

Frodo 4-Hit Combo:
B, X, X, A.

Merry 4-Hit Combo:
Y, A, X, X.

Pippin 4-Hit Combo:
A, A, Down, B.

Sam 4-Hit Combo:
Up, Down, Y, Y

Developer Interviews:
Beat the game once.

Thanks to Revolution readers Dylan Wiebe, Dj Ripper and James Cayzer!