Prince of Persia

It is possible to complete the first level without getting the sword. From the first screen, fall down to the second screen and go one screen right. Stand at the very left edge of the screen and let the guard advance towards you. When he gets close enough, retreat one screen left and he should follow you. Go all the way to the left of this screen, facing the wall. Let the guard come towards you, and climb up onto the ledge just before he gets to you (when he's about at the middle of the screen). Go one screen to the left, and knock out the hidden panel in the ceiling. Climb up, and continue climbing to the top of the screen. Go one screen right and you'll end up at the first screen again. Climb down one screen and you should have enough time to run to the right before the guard gets to you. Continue to the exit. And not to worry -- when you start the second level, you'll magically have your sword!