Beat  the  game.  Then  while playing press pause, hold R + L and
enter the cheat codes.

Invincibility                X, B, X, Down.
Perfect mode                 B, Up, Y, Down.
All attack upgrades          Down, Up, Y, X.
Full health                  X, X, B, B.
Unlimited missile weapons    X, X, Up, B.
Always devastating           Y, Down, Y, Up.
Target indicator             Up, B, Down, X.
Unlock all interviews        A, X, A, Up.
Unlock Faramir               A, A, Y, Y.
Unlock Frodo                 Y, B, B, B.
Unlock Merry                 A, Down, Down, A.
Unlock Pippin                Y, B, X, Down.

Co-op codes:

Share experience             Down, A, A, A.
Share health                 Y, Up, X, X.
Unlimited respawns           B, X, Up, B.

Aragorn codes:

Three-hit combo              X, Down, B, Up.
Four-hit combo               Up, X, Y, Down.
All special abilities        Down, B, Y, Y.
1,000 experience points      Up, X, Y, A.
Level 8 skills               Up, X, Y, Up.
Restore missiles             Y, X, X, Y.

Gandalf codes:

Three-hit combo              Down, A, Y, Down.
Four-hit combo               Down, Y, Up, B.
All special abilities        Up, Down, Y, B.
1,000 experience points      B, Y, Up, Down.
Level 8 skills               B, X, Down, Down.
Restore missiles             Y, Down, A, X.

Gimli codes:

Four-hit combo               Y, X, Up, A.
1,000 experience points      B, B, Y, A.
Level 8 skills               A, B, Down, X.
Restore missiles             B, B, B, A.

Legolas codes:

Three-hit combo              Y, Y, Y, Down.
Four-hit combo               A, B, Y, X.
All special abilities        Y, B, A, B.
1,000 experience points      A, Y, Up, A.
Level 8 skills               X, Up, Up, Down.
Restore missiles             Y, Y, Y, Down.

Merry codes:

Four-hit combo               Y, A, X, X.
1,000 experience points      Down, Down, X, A.
Level 8 skills               Down, Y, A, X.
Restore missiles             X, B, B, Y.

Pippin codes:

Four-hit combo               A, A, Down, B.
1,000 experience points      Y, A, X, A.
Level 8 skills               X, Up, Up, B.
Restore missiles             Up, B, Down, X.

Sam codes:

Four-hit combo               Up, Down, Y, Y.
1,000 experience points      Y, A, Down, A.
Level 8 skills               B, B, Y, Y.
Restore missiles             A, A, B, A.

Faramir codes:

Four-hit combo               A, X, Up, A.
1,000 experience points      X, Y, Up, X.
Level 8 skills               B, Down, Down, Down.
Restore missiles             Y, Up, A, A.

Frodo codes:

Four-hit combo               Down, X, Down, B.
1,000 experience points      Down, Y, Up, Down.
Level 8 skills               B, B, Down, Down.
Restore missiles             Y, Y, Y, B.