skull in campaign
On the level where you find the new halo. When you ride a gondola to this one part where there are 2 jackles with beam rifles and 2 grunts on large plasma canons go inside and there should be a odly put slab of rock in small section jump on it then turn on your light and face forward and there will be a floor jump on it and turn right kill the 2 jackles (if you havent already) and go to the grunt on the left and there should be a large part sticking out jump on to it and go to the end there will be a place where you will have to grenade jump over it and then drop down and there it is just hold x to pick it up.
More tricks, tips and cheats for this game are right here - Halo 2 cheats
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