Black-Eye Skull

Effect: Melee hits instantly recharges your shield.

Where to find: Crow's Nest

How to find: As soon as you start the level, head straight up to the higher level. Head toward the door with the red light, then turn around. Jump onto the racks,than onto the red metal light holders. Than jump onto the ventilation tube. The skull will spawn at the end of the tube.

Blind Skull

Description: "Shoot from the hip"

Stage: First Stage

How To Find: When you get to the area where you see the Phantom overhead (one of the marines will point it out) jump over the rocks and keep following the path to the right. When you get to the cliff there will be a rock over of the side. You can find the skull on the end of the rock.

Cowbell Skull

Effect: Explosive force increased (sputnik from H2)

Level: The Ark

Location: First pick up a grav lift from the small building near where you fight the scarab. Proceed through the level until you reach the second sloping hallway, you should see some platforms halfway down. The skull is on the top level. Toss the grav-lift on the right side of the hall so it lands on the fourth little green dot from the door. Then run, jump, and use the grav-lift to propel you to the top.

Catch Skull:

Enemies use TONS of grenades against you. In the fourth mission play through until you get to the part with the first anti-air wraith. in that part there will be a phantom that comes and drops off a normal wraith. DON'T destroy either of them. There is a small building located by the two wraiths, the skull is on top as long as both wraiths are still there. the easy way to do this is by killing the gunner in the anti-air and all the ghosts. at the building stand on the top of a warthog and jump up or grenade jump up (you might have to grenade jump from the top of the warthog)

Famine Skull

Mission: The Ark

Effect: "Trust us. Bring a magazine." -- Dropped weapons will have less ammo

When you first go into the valley to the right after the wrecked phantom, look to your left where you will see a huge boulder. Use a ghost and get to the side of the boulder that is closest to the bridge overhead. To get the skull, pilot 2 ghosts up the wall to the top of the bridge and stack them one on top of another next to the beam where the skull is placed. Simply jump from the top of the ghosts towards the skull.

Fog Skull

Mission: Floodgate

Effect: "You’ll miss those eyes in the back of your head." -- Your motion sensor disappears.

As you are walking down from the anti-air gun you destroyed in the previous mission, you encounter a ramp . Around this ramp, you hit a checkpoint. At this point, you should also hear a marine yelling, “There! Over There!”. Look up and to the right, directly at the roof of the building next to the missle launcher. There is a flood form which is holding the skull. Kill him before he jumps, and he will drop the skull down  where you can retrieve it. If you kill him too early the skull will get stuck on the roof so timing is important.

Grunt Birthday Party skull

Effect: Headshots cause enemies to explode.

Where to find: Crow's Nest

How to find: Right after the first objective, while en route to the barracks, you will fall down onto a pipe. At the end of this pipe, look over the edge to see a small space a few feet below you. Simply drop over and, as quicly as you can, pull back to land under the floor you were just on. The skull will be at the end.

Iron Skull

Effect: When either player dies in Co-Op on any difficulty both players will restart at last check point.

Where to Find: Sierra 117

How to find: In the area where you rescue Sarge, behind the prison cell is a large ledge. Go to the far right side and jump on the boxes, then onto the pipes to get up on the ledge, go to the far end of the ledge. Turn two corners and the skull is at the far end.

Mythic Skull

Effect: Every enemy on the field now has double their normal amount of health.

Where to find: Halo

How to find: As soon as the mission starts walk up the hill in front of you and into the cave. Follow the right side of the cave. After a large boulder you will see a path on your right, take the short path and it will be at the end.

The 7 Terminals

The Ark:

1. Start the mission and once you enter the first building take a left into another door and now you should be in a curved corridor. On the inside is a Terminal.
2. After activating the bridge to let your comrades accross the gap, do a 180 and you should see it.
3. In the third building after defeating the scarab, kill the group of sleeping covenant, then follow the corridor downwards. Once you reach a door in front that is locked, immediately on the left there should be an open door. Go through and walk straight off, then do a 180 to find a secret room. It is in this room.

The Covenant:

1. When in the first tower standing on the lift, face the access panel and turn left. Jump over and it's right there.
2. Land your hornet on the second tower, walk towards the entrance but when you see the locked door, do a 180. It will be right in front of you.
3. When in the third tower standing on the lift, face the access panel and turn right. Jump over and it's right there.

Halo:

1. After reaching the end of the first cave, hug the right wall and you will see a building. Jump up onto the walkway and hang a left once inside. It's right there.

Thunderstorm Skull

Mission: The Covenant

Effect: "Field promotions for everyone!" -- Upgrades enemies to their stronger versions.

After you shut down tower 1 and get access to the hornet, fly to tower 2. While walking up the stairs, go to the middle part that connects both and there should be a stair leading up to a platform where the skull is.

Tilt Skull

Mission: Cortana

Effect: "What was once resistant is now immunity" -- Enemies have different body parts that may be resistance to different weapons

When in the circular type room with all the flood look for a small structure piece next to two archways. Jump on top if it and up on the rocks to the top left, than turn left and jump up again. Do a 180 turn and jump to the rocks across from you. After that follow the the rock sticking out and leading up on top of of the original circular room, the skull will be in a pile of blood.