Andy Serkis interview - Successfully complete the game to unlock the Andy Serkis interview.
Billy Boyd interview - Successfully complete the game to unlock the Billy Boyd interview.
Cheat mode - Pause the game during a level, then hold L + R and enter one of the following codes to active the corresponding cheat function. If you entered the code correctly, you will hear a sound.
Cirith Ungol - With Sam, wait for someone to knock over another Orc then run up and quickly kill him. Eliminate them one by one and eventually get up to the Boss. An easy way to kill him is to keep throwing pikes at him. Make sure time does not run out while fighting the Orcs.
David Menham interview - Successfully complete the game to unlock the David Menham interview.
Defeating Gollum in Crack Of Doom - Gollum is not effected by swords. You must parry and push him towards the edge. Once you do so, he should lose his balance and start to fall. He will try to climb back up. At this time, stab his hands with your killing move. It will take awhile to defeat eat him.
Defeating the King Of The Dead - When fighting the King Of The Dead, always approach him when you see the green/yellow/red bar above him (depending on how much damage you inflict on him) and parry first. In the beginning he will attack three times (usually with a green bar above him), four times (usually with a yellow bar above him), and five times (usually when a red bar is above him). Timing is also a factor. As a rule, you want him to have a yellow or red damage bar above him by the time he summons "Winds Of The Mountain".
Dom Monaghan interview - Successfully complete the game to unlock the Dom Monaghan interview.
Double kill in multi-player mode - In co-operative multi-player mode, if one player you starts to do a Bane (Orc, Warrior, or Sauron's Bane), attack the enemy that the other player is using the Bane on to get two kills. Note: The other player will get a Perfect while you will get either a Fair, Good, or Excellent.
Easy combo attacks - You can use the C-stick to do quick combo attacks. C-stick Up and C-stick Down work very well on any creature that has a shield.
Easy experience in Shelob's Lair - When you get to the part where Sam says "I can't get by this", fight all the Orcs. Once you have finished, go to the top of the ridge where you push off the rocks. Push the rock and the Orcs will be there, giving you more experience.
Easy experience in South Gate - Complete all the tasks until you have the gate open. Do not go through the gate. Just fight all the creatures you can as they keep respawning. Try to use combos to get into Perfect mode then most of the enemies are worth 300 experience points. When you cannot fight anymore, leave. Some small creatures give out red health potions, allowing you to fight for a long period of time.
Entering Perfect mode - Use the following trick to enter Perfect mode very quickly without taking any damage. When surrounded by a group of enemies, rapidly press B (Parry) to block all incoming attacks. As you block, your special meter rises very quickly, bringing you to Perfect mode. You can now quickly take out all nearby enemies while racking up the perfects. This is very useful in Pelennor Fields.
Extra experience - Use a link cable to connect to a GameCube and play its version of The Lord Of The Rings: The Return Of The King. For every level completed on the Game Boy Advanced version, you will have 1,000 experience points to add to a character in the GameCube version.
Hidden trailer - Allow the game to idle at the "Press Start" screen. After a few minutes, a new trailer for the game will play.
Killing Orcs in Road To Isengard - When you get to the part where you have to kill 65 Orcs, there is a small crack that you can hide in while the three Ents kill all the Orcs. There are some that will stop at the opening where the Orcs appear. You can just kill with your ranged attacks.
Killing enemies - A great way to kill a vast amount of enemies is to use the speed attack as much as possible while moving frequently. For example, when surrounded by Orcs, rapidly press A while moving around to knock enemies to the ground, kill them, and enter into perfect mode faster. This is a great strategy to prevent back attacks and when you are greatly outnumbered.
Link moves - Learn how to "Link Move" (any special move that requires you to parry first then followed by the combo move). It will immediately place you in Perfect mode.
Outnumbered battles - Do not be a hero. When outnumbered, immediately press A(3) for speed attacks, then when you have some room, press Y(2) to use a fierce combo or perform your special moves. Do this enough times and you will enter Perfect mode.
Palantir of Saruman level - Successfully complete the game to unlock the Palantir of Saruman level.
Palantir of Sauron level - Successfully complete the game with a character at level 10 to unlock the Palantir of Sauron level.
Paths Of The Dead - After you defeat the King of the Dead, you have to run back through the level as the whole place comes down on your head. When you get to the white mists that really slow you down, try facing the opposite direction and jump backwards. This lets you get through the mist faster.
Play as Faramir - Successfully complete the game to unlock Faramir.
Play as Merry - Successfully complete the game to unlock Merry.
Play as Pippen - Successfully complete the game to unlock Pippen.
Purchasing upgrades - When you have the option to purchase new skills, make sure you get the skill that allows you longer life, then purchase skills for the entire team starting at level 2 and working up to level 8 first.
Siege towers in Walls Of Minas Tirith - Destroy the first siege tower with the catapult near the middle of the wall. It requires two hits to topple. For the second tower that rolls over to the far right, you can just use your projectiles to take it out. Keep firing at it in order to bring it down.