First be one of the really tall characters (aragorn, legolas or isidur) and go on the 3rd level (The one where you face the squid) nearer the middle of the level there are 3 archers, kill em and cross the thin bridge. WARNING THIS IS COMPLETELY RANDOM THIS DOES NOT ALWAYS WORK! For some reason on my xbox with my character stands on the edge befor gimli says something about the mines of moria my character falls off the edge! It's wierd
If you are stuck killing cave trolls try hiting them then dodging their attack and keep on repeating this move then they die. if you can't kill two keep on going round and round and eventulley one will die because the hit each other.