If you have any questions or comments PM me, this guide consists of the following:

• Location of the Gold Skulls
• Location of the Silver Skulls
• What Each Skull Does When Activated
• Location of the Terminals

Special thanks to lc3.

Hint skull collecting: During your expedition in collecting skulls, keep in mind that you must start the level from the beginning but once you get the skull you are looking for, you can save and quit at any time without finishing the level.

--- Sierra 117 ---

• Iron Skull (Gold) - At the end of the level when the pelican arrives, while looking at the pelican, turn approximately 90 degrees to the left and jump onto the large ledge. Walk all the way down the ledge until you see another, but smaller ledge on the building in front of you. Jump onto it and follow it all the way to the end where the skull will be laying in the shadows.
• Blind (Silver) - Only about 1 minute into the level a ship flys over and lands with water in the background. The skull is over to the far right of the screen.

--- Crow's Nest ---

• Black Eye Skull (Gold) - At the beginning of the level there is a massive pipe above you with the skull on top. Walk up the two small stairs and on the left there is some shelves you can jump on to. Jump up to the metal bars and then onto the pipe. Walk to the end and the skull is laying there.
• Grunt Birthday Party (Silver) - A few minutes into the level you go through a half circle metal tunnel. At the end of the tunnel you jump down a big hole. Before you jump turn around and fall backwards. Push forward as you start to fall down and you will land on a ledge, the skull will be sitting right in front of you.

--- Tsavo Highway ---

• Tough Luck Skull (Gold) - This skull is located after you go through the shield that blocks the road. You will exit onto a bridge with a large pipe to your left. Go up one of the yellow ladders and turn right. Continue down and jump over the yellow guard thing that blocks your way. Immediately turn left and jump all the way down onto the grey support below. Walk down the support and look left, you will see a ledge coming out of the cliff with the skull laying on top of the ledge.
• No Silver Skull

--- The Storm ---

• Catch Skull (Gold) - From the start of the level continue through the level until you first get outside. Get a vehicle and kill the enemies.Then go to the top right corner on the plains where you will see some sort of small silo tower, on top of this tower is the skull. To get to the skull though you must either grenade jump up, or if that does not work park a vehicle by it and use that for extra lift. If you do not know how to grenade jump first face the direction you want to go, then throw a grenade just in front of your feet, then run and jump towards your desired location, the explosion beneath will give you some extra lift but be careful though this can easily kill you!
• No Silver Skull

--- Floodgate ---

• Fog Skull (Gold) - At the very beginning of the level as you walk towards the stairs leading into the town look straight up and right to the first building on your right. An individual flood will appear and then jump across, and out of the map. Shoot him before he jumps and the skull will fly down to the ground. If you happen to shoot to early the flood will drop the skull on the roof he was about to jump off of so you must retry.
• No Silver Skull

--- The Ark ---

• Famine Skull (Gold) - This skull is located after you get the mongoose and drive over some small cliffs. Then you have 2 choices: straight or turn right, either way you choose you will end up in the same spot. Continue down the path and defeat the ghosts that attack you, under a big "metal cover thing". Then, after coming out from under the big "metal cover thing", you have to turn right to go up a path leading to some enemies and a small cave/tunnel. Instead stop on the path, and look right to see a bolder jutting out of a rock. Hop on the top of the bolder and up onto the rock. Then jump over onto the top of the big "metal cover thing". Turn left and walk up to the last support that juts out the skull is at the end of it. This next part can be difficult. Using a grenade, grenade jump forwards and onto the support to get the skull. If you do not know how to grenade jump first face the direction you want to go, then throw a grenade just in front of your feet, then run and jump towards your desired location, the explosion beneath will give you some extra lift but be careful though this can easily kill you!
• Cowbell (Silver) - To obtain this skull begin by getting to the part of the level where you battle the Scarab. Across from the building with the ramp you are supposed to go up is another structure with a few gravity lifts, grab one you will be needing it. After getting a gravity lift head up the huge ramp, and head inside of the building. Pass through a few of the rooms in this building, and you will eventually come to a room with a bunch of explosive crates. Right after this room there is a staircase/hallway that leads to the level below. The skull is located at the top of the room, at the point where you turn on the staircase to head for the next part of the slope. There are four platforms above you, the skull is on the top platform. Use the gravity lift to reach the skull.

--- The Covenant ---

• Thunderstorm Skull (Gold) - After you shut down the first tower get a hornet and fly over to tower 2. Once you land, head up the staircases as if you were going to the entrance, but just before look towards the center to see the dividing staircase that leads to a platform. Walk to the end and the skull is sitting on the ground.
• IWHBYD (Silver) - After defeating the Scarabs and going inside, get to the location with all 7 Ring Holograms. You must jump through the rings in a specific order. That order is as follows (1 is at the entrance, 7 is at the end): 4 6 5 4 5 3 4
  These rings also produce the notes:
  E G F# E F# D
  After jumping through them in this sequence, you will be awarded the “I Would Have Been Your Daddy Skull”. It will be right next to the bridge that brings you over to the Prophet of Truth.

--- Cortana ---

• Tilt Skull (Gold) - Continue through the level until you drop down an open hole into a small room. In this room there will be an open door and to the right there will a dead elite with an energy sword next to it. In the next room there is a circular floor. Kill the flood and walk straight to the middle of the platform and turn approximately to the left 90 degrees. You should see two small ramps leading downwards. Hop on to the divider of the ramps and up onto the "mushroom like" platform coming out of the wall to your left. Then jump onto the platform above you. Turn around approximately 180 degrees and look up, jump to the next platform and run across the pipe onto, a bigger, purple platform. Sitting in the center of a puddle of bones and other matter is the skull.
• No Silver Skull

--- Halo ---

• Mythic Skull (Gold) - This skull is at the beginning of the level. Go into the cave in front of you, straight away keep to the right and there is a small path that leads off to some rocks, the skull is laying in front of them.
• No Silver Skull

What Do The Skulls Do?

Ok you got all the skulls but now you don't know what they do? I will explain what all of them do!

--- Gold Skulls ---

• Iron Skull - If you die, you restart from the beginning of the level.
• Black Eye Skull - When you lose your shield, the only way to get it back is to melee an enemy.
• Tough Luck Skull - Your enemies never back down, always make their saving throws, and always charge you.
• Catch Skull - Your enemies throw lots of grenades.
• Fog Skull - You lose your motion sensor.
• Famine Skull - Enemies drop 50% of the ammo they normally would drop.
• Thunderstorm Skull - All enemies are given a field promotion, and ranked up to their next available level.
• Tilt Skull - Enemies will become stronger
• Mythic Skull - Enemies have double the health.

--- Silver Skulls ---

• Blind - The arms of the player and the motion tracker disappear
• Grunt Birthday Party - Grunts explode if you get a head shot.
• Cow Bell - Explosions are much bigger.
• IWHBYD - Unlocks Hidden Dialogue throughout Halo 3’s Campaign.