Special Note: It is good luck to hit your co-players in the head with the skull once you find it.
Blind Skull - Silver
Effect: You lose your HUD when this skull is turned on. You won’t see your weapons, shield, radar, etc.
Location: The “Blind Skull” is the first of the Silver Skulls in Halo 3, and can be found in the first mission, “Sierra 117″. It is located relatively close to the beginning of the mission. After your first encounter with the Gold Armor Brute, Two enemy dropships will appear a bit further down the stream. Go towards the dropship that is furthest away, and stay on the right side of the stream. Continue along the right (towards the cliff edge), and a rock will jut out a bit over the large lake. The Blind Skull is located on this rock.
Grunt Birthday Party - Silver
Effect: When you get a headshot on an enemy Grunt, they will explode into confetti, and you’ll hear children cheer, “Yay!” in excitement.
Location: This is one of the more fun Silver Skulls in Halo 3. The “Grunt Birthday Party Skull” is located on the second mission, “Crow’s Nest”, just before the area where you team up with the Arbiter (it’s the piping area where you see Drones buzzing in and out of an array of pipes). Just before you jump down the pipe to meet up with the Arbiter, stop at the ledge, and look directly below you. Along the wall that you drop down, there is a small ledge with a green arrow pointing backwards. Jump onto this ledge (rather than all the way down), and go inside this secret room. The skull is in the dead center of the room.
Cowbell Skull - Silver
Effect: Explosions become much bigger in the game.
Location: The “Cowbell Skull” is found on the level “The Ark”, and marks the third Silver Skull found in the game. It’s fairly far into the level, so it takes a bit of time to find it. Begin by heading all the way to the part of the level where you battle the Scarab. After defeating it, look in the middle of the desert area which you battled it in for a fairly large structure (it’s the building you see if you are at the bottom of the ramp you are supposed to go up, and turn to look in the opposite direction). Inside of this structure are several Gravity Lifts. Take one of these for later. Next, head up the huge ramp, and head inside of the building (the one with the cartographer inside). Pass through a few of the rooms in this building, and you’ll eventually come to a room with a whole lot of Explosive crates. Right after this room 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 uppermost of these platforms. Use the Gravity Lift to jump up to it, and there you have it!
IWHBYD Skull - Silver
Effect: Unlocks hidden dialogue throughout Halo 3’s campaign.
Location: The Skull is located in the level, “The Covenant”. 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
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.
When you jump through the final halo, the rings will start lighting up in a linear fasion. Go grab the Skull over at the Bridge that connects to the Control Panel. When you grab the skull, all of the rings will start playing the main Halo Theme Song.
You can work as a team in co-op with 2-4 players jumping through the rings to speed up the process. Just make sure that the rings are jumped through in the correct order as a team. It really speeds things up this way.
If you mess up, you can start the sequence over without restarting the mission.


