On the Walls of Minas Tirth, when the third tower comes and you fire the catapult at it, a Nazgul appears and you can kill it. If you do, it com crashing down on the far right towr, blocking your path to the last sig tower. Use th grapling hooks to cross th rubble. If you don't kill it and fire th catapult a second time, it will reappear and grab one on the men. Kind of fun to watch. A nic tip for this lvl, when the last tower comes, let th uruks climb out for a bit, thn use Gandalf's shield and charge in and kill everything. Very easy to perfct mode.
Another easy lvl for gtting a perfect ranking is Cirith Ungol. Just be in perfect mode before you do something that causes mass destruction.
The game is really great, but there ar som obvious differncs. The main example is Grond. In the game, its just a simple ram, but in the movie, it's a firey headpiece that looks cool. The game was great, but it should hav shown mor scenes for RotK. Can't think of anymore to say for now. Will reply after there are more replies to this.