Secret Skulls

 

Grunt Birthday Party:

In the level Arbiter on Legendary. Once you get to the first banshee section, fly immediately straight down all the way to the bottom of the map. In one of the cracks where the large cylinders connect to the station. There will be a circle of grunts dancing around a skull. When you pick up the skull; it will say Grunt Birthday Party on the screen. Now when you kill a enemy with a projectile weapon, they will blow up like a Plasma Grenade was stuck to them. To get rid of this feature use the same method as the blind mode.

 

 Iron mode:

On the last Master Chief Level, on Legendary Difficulty, when you enter the final Gravity Lift, look up. A skull will pass through you extemely quickly so you must start holding X a bit before you actually pass it to grab hold of it. Once you grab the Iron Skull, Iron Mode will be activated.

 

Mythic Mode:

In "Sacred Icon" there is a semi outdoor area which has the same type of area right next to it. There is a large sentinel in front of each one. Go past this area and down the piston and you'll be in a vary dark and dank flood infested area. There's a stack of 6 or 7 boxes as you enter the room. Use them to jump up to the landing above. There are a handful of alcoves on your right hand side. The skull is in the third alcove, floating above a dead human flood. When you are in this mode flood are invincible when driving vehicles.  

 

Sputnik mode: 

At the start of "Quarantine Zone" turn directly around, and you should see a tunnel. Head down the tunnel and go straight until you exit it. Go straight across the open area, and you'll come across a broken pipe tunnel on your right. Straight in front of you is a small ledge running across the wall, above the green pit. Carefully get onto that small ledge and walk all the way to the end of the ledge to find the Sputnik skull. In this mode explosion force and melee force is greater.

 

Thunderstorm Mode:

  In the large room after the armory, you need to use a duck-jump to get onto a light fixture on the right wall (right of the room when you enter) and then jump from there onto the higher area. There is a series of diagonal beams. Walk up one near to the end of it and use it to duck-jump onto one of the rails. You can fall between the rails, so be careful. Once on the rail, walk down it until you can jump onto the highest platform. Then bash the trashcan. It says Thunderstorm when you pick it up.

 Blind Skull:

First start the level where you are in the streets. Then go throught the first door and there will be a grunt to kill. Jump on the light above an elevator door. Look left and jump and crouch to get up a higher ledge. Once your up, look left and there should be a little alley way that goes pretty far in. You'll find a skull, a scope, and a pile of grenades. Hold X over the Skull and then the screen should blink and it will say "BLIND". You won't be able to see your gun or anything on the screen. It pretty crazy.(It will only end if you turn the game off.)

Black Eye Mode:

In the level "The Great Journey" The skull is on top of the contol room where Johnson blows up the door. Shield won't regenarate if picked up. 

 

Angry Mode:

When you are the Master Chief trying to recover the index from the Prophet of Truth on the Covenate Holy City go until you reach the first outdoor area with dirt and vegetation. Take a right as you enter this room and run up to the wall past the gravity lift that leads up to the sniper point. Get on top of the wall by going up the dirt mound on your left. Follow the wall until you reach the floating skull called "Angry".