When you're playing as Gandalf, you have the hardest game ahead of you. At the very end of the last level, you have to defeat about 4-8 axe-wielding orcs. I would suggest using the lightbeam power, and shooting it at the orcs continually. After you've defeated the orcs, two trolls will come in. They will both hammer at you. There's a 50% chance that one of the trolls will whack the other one and kill it. After this has happened, use your lightbeam to shoot the other troll. Do this continually until the troll is dead. Then a Ringwraith will come in. This is the easy part. Just shoot the Ringwraith with the lightbeam. It took me about two hits to kill him the first time.