Iron Man 2

Right at the start of the level, you will need to press the switch that is at the other end of the room. After pressing it, wait until the door to the next room opens. Once it opens go in and press the second switch. The camera will zoom out showing 3 layers of green lasers. You must make it down without touching any of them.

Just sit slightly above the laser and when you think its safe to move press to lower yourself. I think you can also keep tapping while hovering above the lasers to fall right to the bottom. I did this when I replayed the level. I'm not sure if it was luck or if its possible doing it like that. If you touch a laser simply press start and restart checkpoint.