Search the indicated location to find the corresponding skull. Note: Updated graphics must be enabled to find and collect the skulls.

Bandanna skull: In the "The Silent Cartographer" mission, after the Covenant lock the doors, go to the security override building. Turn right in the tunnel before activating the console, then go outside. Turn right again to find the exterior of the tunnel you just came through. The skull is on top of this tunnel, at the far end. Grenade jump on top to collect the Bandanna skull. This skull gives you infinite ammunition.

Boom skull: In the "Halo" mission, approach the tunnel in a Warthog. Drive to the left, get out, and walk up the narrow path to find the Boom skull.

Famine skull: In "The Silent Cartographer" mission, turn around at the start, and walk around the island until you reach the large rock where the Pelican crash site is found later. Walk up to the top of the rock to find the Famine skull.

Foreigner skull: In the "Truth And Reconciliation" mission, enter the large hanger before the brig on the lower level. You will see the Covenant drop ship that Keys eventually pilots. Look inside the door farthest from where you first enter the room and to the right to find the Foreigner skull. Note:The door is locked and only allows enemies to enter the fight. Run into the door when it is opening to enter it.

Iron skull: At the beginning of "The Pillar Of Autumn" mission, immediately turn around, and look behind the two large boxes by the wall to find the Iron skull.

Malfunction skull: In the "Assault On The Control Room" mission, reach the large underground section past the frozen lake with the two Wraiths and the Banshee. Look for the turret on a broken bridge to the right. Walk toward the bridge, and look down in the chasm to the left to find a conduit with the Malfunction skull.

Mythic skull: At the beginning of the "Halo" mission, move toward the large waterfall. The Mythic skull is behind the large rock with plants growing down above it.

Recession skull: In the "343 Guilty Spark" mission, after getting off Pelican E419 at the start, turn left to face the left side of a very large glowing green tree. Remain in that direction, and move directly ahead while avoiding obstacles. You will eventually reach a hill with two trees and a bush in the middle. The Recession skull is behind the bush.