Skulls

Here is the video to find all 9 gold skulls in halo 3

Levels1st skull - Sierra 117 2nd skull - Crow's Nest 3rd skull - Tsavo Highway 4th skull - The Storm 5th skull - Floodgate 6th skull - The Ark 7th skull - The Covenant 8th skull - Cortana 9th skull - Halo