ALL 8 ARTIFACT LOCATIONS

Bilbo's Map - Aragon, Frodo, Legolas
Found in a Dimril Dale map. An elf will ask you to recover a lost item from some orcs. Two orcs will be guarding a chest and one of them will drop the artifact when you kill it.

Narsil, the Sword of Isildur - Aragorn, Legolas
Found in Lothlorien at the bottom of the map.
It can also be found by Frodo in Crinfanti

Chain Link of Morgul - Aragorn, Legolas
Near the end of a Rohan map, you start the level between three bushes (one big on the right and two smaller ones on the left). a bright blue troll will appear and start running away. it invincible but you can follow it to a cave, and there the chainmail will appear.

Sauron's Ashes - Aragorn, Gandalf, Legolas, Frodo
This is found in a tower at Helm's Deep up a large flight of stairs to the North. A chest will appear to the left of the forge after opening all the boxes and chests on the Northeast wall.
Frodo doesn't go to Helm's Deep but he can find the Ashes in a Mordor or Emyn Muil map.

Moria's Lamp - Legolas
In the map where Legolas, Aragorn, and Gimli meet Gandalf, Moria's Lamp is hidden in a secret area at the top of the map. You have take a path to the right of the screen and goup, then left, and then when you walk into the edge of the screen, you then disappear to another area where you can easily get the lamp.

Balin's Book - Gandalf
This is found in Balin's Tomb before the Cave Troll enters just below the actual tomb.

Troll Tusk - Frodo
In Moria (just after the bridge of Kaza-dum), the Troll
Tusk can be found in the Northeast corner.

Judkins Scrolls - Eowyn
In one map a woman will ask you to clear town hall a large building in the center of the area. Instead of immediately going in, go near it, then wander around the level for a while killing things and collecting items. When you return (usually) you can find the artifact in front of a wood pile to the west of the town hall door.
Sent in by ~Niceguy62131121~

Multiplayer:

Gimli - Beat the game with two characters on any difficulty, then in multiplayer select an empty slot and choose Gimli as your character.

Misty Mountains - Collect all 8 artefacts found in the game.
Sent in by Nina Keys

Duplicating items in multi-player mode - Trade an item from character one to char two saves and have both turn off the game. Both characters should now have the item.

Easy levels and gems - If you are having too much difficulty passing a level, wait until you are about to die then save your game and quit. Restart that game and you will start back at the beginning with full health, full spirit, the experience you just gained, and all enemies are re-spawned for you to kill again. Repeat this several times to gain easy level ups, gems for buying power-ups and items, and to rack up kills in order to reach the 500 point skill increases.

Easy spirit - Find a place where Orcs, Trolls, Wargs, young Wargs, or Goblins cannot get you. For example, in the stone fence above the health pool when you are against the Fargon Troll (only the little Troll can get you). Then, stand still for about six to ten seconds.

Moria: Easy Orc kills - At the beginning in the mazes of Moria, Orcs scream and run towards you on another side of the wall. You can kill them through the wall.

Special Unlockable Movie - To unlock a comical movie featuring a cave troll and several squirrels: Beat the game with all of the characters.

Weapon Power-up - If you hold down the "B" button your weapon will start sparkling. With a sword it will kill a Goblin or an Orc in one hit.
Sent in by katoa

Multi-player mode Misty Mountains level:  Successfully complete the game with all eight artifacts.

Multi-player mode Gimli:  Successfully complete the game with two characters under any difficulty setting.

Hidden ending sequence:  Successfully complete the game with all characters to view a sequence featuring squirrels and a Cave Troll.

Easy experience:  Go to a level with a Boss. Kill it and save the game. Then, quit and load that game again. You will still have the experience when the game was saved. Keep doing this until you get the desired amount of experience.

Recover health:  Play as Legolas with the skills where you can Meditate (stand still and recover hit points ) and Forest Friend (call hawks to distract and injure the foe). Use Meditate and Forest Friend at the same time and your hit points will recover twice as fast.

Duplicating items in multi-player mode:  Trade an item from character one to char two saves and have both turn off the game. Both characters should now have the item.

Moving around quicker:  Always keep a pair of sandals in your backpack. They usually come in handy. For example, if you find a forge, a shrine, or an Ent Pool, you will probably want to keep returning there to sell things. They are also useful when you want to run away from an enemy. In most shoes, boots, etc., you will move a lot slower than you would in sandals.

Legolas: Use Overdraw quickly:  For those who use Overdraw with Legolas, use the following trick to eliminate the delay when he starts the attack. Press B (normal attack) then immediately before he shoots the arrow, press A (which should be set to Overdraw). You will hear the "whoosh" sound if done correctly To charge the Overdraw, hold A after pressing B .

Legolas: Use Elvish blades:  When playing as Legolas, lure an enemy to a box, crate, pot, etc. then press B as if to break it. However, be on one side of the box so that you can press B and not brake it. Then, just keep hitting your enemy until it dies.

Defeating the Balrog:  When you are facing the Balrog, immediately go to the top left corner. Shove yourself in as far as possible. The Balrog will appear, hit the wall, and always miss you. Then, launch fireworks or Zaps at him. If you really want to kill him the old fashioned way, sit there while pressing B .

Defeating Lurtz:  When facing Lurtz as Aragorn, use the active skill "Summon Legolas". Legolas will appear and start fighting the nearest enemy, in this case Lurtz. You can now fight alongside him until Lurtz is dead. Usually this does not take very long.

Defeating Ringwraiths:  When your corruption is at maximum (flashing eye), Ringwraiths will appear. However, they will only appear at the top of you. You can trap them by standing on a ledge and running to the top end before they appear. From there, you can kill them with ranged attacks or lure them to an open space one by one.

As Legolas, in the level where you start out with Aragorn and a Orc and two Swamp Ghosts (Flames), do not kill any crows unless they attack you. Run until all the crows that fly away are gone, then run back to the fence (it is more like a wall) and push up against it. The Ringwraiths will appear above you, where they cannot hurt you. Go to the side of the gate and shoot them until they die, then go around and get the items. Note: Overdraw works especially well.

Uruk-Hai:  The Uruk-Hai with the hammer falls forward when he really dies and backwards when it is not. Also you can check if he drops an item. He does so when he dies. However, sometimes corpses do not leave items.

Balin's Tomb: Defeating the Troll:  When you first enter this room, note the first doorway before you proceed to the actual tomb. When the Troll appears, run back to the doorway. You will see that there is a slanted area. Position yourself such that the troll is in that corner and move southwards so that he cannot move further in. From here you can kill him, even with your melee attacks. Alternately, run back to the first room you were in and use the attack through walls glitch to hack and slash until the Troll dies.

Just before the Cave Troll comes in, if you are standing against the back wall, all the way to the left is a flight of stairs leading to a ledge that overlooks the actual tomb. When the troll enters, run up the stairs to the ledge and use your long range attack on him. If you are not fast enough, he will follow you up the stairs. Just run back down the stairs and try to defeat him from the bottom of the ledge.

When the Cave Troll enters, run all the way to the left and up the stairs, killing Orcs on the way. When the Troll comes over, hit him with your sword or arrows. If you have any special skills, use them (for example, Gandalf's Fireworks or Zaps).

With Gandalf, go to the doorway where you first entered the Cave Troll room. Lure the Cave Troll there. He cannot reach you. You can either use the Sunburst spell then run up and attack him while he is stunned, or use the Zap or Firework spells.

Moria: Hidden location:  When you are in the West Halls of Moria with any character, defeat the green Orc and go to the right. You will see a door. You can enter it and go to a different place.

Moria: Get equipment:  In the Mines Of Moria, kill the Troll and get all items but do not go ahead. Instead, save and quit the game. Keep killing the troll which has respawned until you are satisfied with the equipment. If you need to rest and regain your health, use the room in the upper left corner. There may be a few Goblins, but the Troll cannot get you there.