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

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

Co-op codes: 

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

Aragorn codes: 

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

Gandalf codes: 

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

Gimli codes: 

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

Legolas codes: 

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

Merry codes: 

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

Pippin codes: 

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

Sam codes: 

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

Faramir codes: 

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

Frodo codes: 

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