Halo 2: secret skulls!
Ok gamers, there are secret skulls all over the game. Well not exactly every where but there are enough to keep you busy. Ill give you the location for one of them but the rest is up to you. on the second level, right at the begining, your pelican crashes. when you wake up, you go through the door you would useually go through to continue the level, look left, and kill the grunt. turn right without continuing on and there will be a door that is closed. Jump up on to the ledge above the door then to the roof top next to you. it may take a few tries, so dont get discouraged. nex run along te path and you will find a skull. pick it up and your entire display goes away. there are lots more that are alot cooler than that so keep looking. I have even recently discovered a skull for invincibility, but then it takes the chalenge away.