Halo

Go To Level: The Silent Cartogropher.

Right When you start it will tell you to kill the bad guys right in front of you, 

but instead go  the oposite way around the island.

Walk until you find 3 dead men on rocks there will be ammo and health and a extra buggy.

Take the buggy around the island until you see a huge space ship take off. 

Go up the ramp and go into the bulding with the buggy.

Follow the path down to the bottom of the stairs in the building.

Rush down because they will close the door.

If you go fast enough you will ride right in to the middle of the door. 

The Level is now now cut in half!