Halo 2 Easter Egg - Skulls

Cheat: Grunt B-Day Skull
Difficulty: Legendary
Level: The Arbiter
Word: Grunt Birthday Party
Effect: Shoot enemy in the head and they will explode.

The very first time you get a banshee, fly down, below you is a large beamlike structure (not to be confused with the one directly below you that turns and goes vertical) running from the arm of the station you just came out of to one exactly like it on the side opposite. Below this structure are 3 cylinders hanging down, with cylinders of light shooting out of the bottom that look like they are what keeps the station floating. If my explanation is too vague, they are the absolute lowest parts of the station. Now go to the middle engine and land on the top part of it. This and the other engines connect to the large structure mentioned earlier. The tops of the engines come up to meet the structure at an angle, where this angle is under the connecting structure and coming up to meet it, there is a place to walk (like being under a bridge). Under one side you will see the six grunts with the skull in the middle.

Cheat: Catch Skull
Difficulty: Legendary
Level: Metropolis
Word: Catch
Effect: Allies throw alot of plasma grenades.

Right after you get out of the sewers(Tunnel), there is a big area and 2 ghosts, kill every thing first, then go to the middle of it where you see a arc that leads up onto a building, grenade jump by it to get enough height to start climbing it. When you get to the top take a left and hug the wall around the structure and the skull will be there.

Cheat: Envy skull
Difficulty: Legendary
Level: Delta Halo
Word: Envy
Effect: Cloak instead of Flashlight, 5 second cloak with 10 second recharge

When you first come out of the big building and see the turret and 5/6 shield up on the wall there is a wall over to the left hand side with the two grunt turrets on it, the big block and door are at the far end of that wall... In the room that the block is blocking there are two dead grunts and two plasma swords. There's a door being blocked by a rock. Jump on the rock. Then jump on the ledge that's located above the blocked doorway. Turn left and jump up on another ledge. Grenade jump up to where you'll find Two Red Elites - That become cloaked, surrounding a skull. Pick it up, and it reads Envy.

Cheat: Assassins Skull
Difficulty: Legendary
Level: Regret
Word: Assassins
Effect: All enemies in game are permanently cloaked, AI cannot see them and so are no help at all.

Just after you get off the gondola, and go in the structure, there is a big block of stone, jump on that an you can get on a ledge that leads out to the Covenant turrets, facing back towards the structure, jump up another level around the right side of the structure, It is pretty straight lined from here. You should find the Skull on a ledge when you make it around. No visible change to the HUD, BUT all enemies become invisible.

Cheat: Anger Skull
Difficulty: Legendary Level: Gravemind Word: Anger Effect: ??????? Here is another Halo 2 skull: Fight all the way through the Covenant city until you reach the outdoors. As soon as you are outside, stick to the right-hand side and walk along the wall. You should see a Covenant wall thingy with a red rail on it. Jump up to it (crouch jump helps) and at the end there is the Anger skull in a small grav-lift.

Cheat: Iron Skull
Difficulty: Legendary
Level: High Charity
Word: Iron
Effect: Allies are immune to melee attacks

On the final grav-lift on "high Charity", look up. A skull will pass you by. Hold X as it passes you to receive the status.

Cheat: Famine Skull
Difficulty: Legendary
Level: Oracle
Word: famine
Effect: Weapons picked up only have half ammo.

After getting off the long elevator ride, you will come to a room where convent and flood are fighting below you, and you have to break the glass to get to where they are fighting. If you crouch/grenade jump up on the opposite side of where you came down, the skull should be up there.

Cheat: Black Eye Skull
Difficulty: Legendary
Level: Great Journey
Word: Black Eye
Effect: Shield won’t regenerate, when you melee someone you get energy power back, so if you melee someone you get a little bit of shield. So you can get a bit at a time all the way to overshield!

SGT Johnson will pilot the scarab and shoot at a building I am calling the Control Tower. If you take a banshee to the tower you will notice that, aside from where spires jut out of it, it has a round slope all the way around. If you take the banshee right up to the slope and as high as you can go, you can almost get over it. Here you must jump out of your banshee to land on the less steep part of the slope. If you turn your banshee to the side or all the way around, it may make it easier to land on the less steep part. Also, try to have your banshee land on a platform below, so you can use it to get back. Once you are on the slope, climb the rest of the way up it. If you are on the right of the door, then you have to jump onto the ledge next to the main part of the building, and then walk up a steep part in the direction of the door. Walk up that, then around and down on the other side. On this side (left of the door from scarab's perspective) you can walk onto the hills and grass. You will notice several angled spires, some of which connect to the building. You must climb the one that is directly opposite the door you would use to enter the tower. It's steep but you can walk up it. I suggest jumping while walking to speed up the process. At the top is a skull which gives you the "black eye" effect - you only recover shields by meleeing enemies. This is only found on legendary. Reverse the process to get back to your banshee (hopefully) or just jump off a cliff and the effect will stay with you.

Cheat: Infinite Skull
Difficulty: Legendary
Level: Quarantine Zone
Word: Sputnik
Effect: Explosions and melee have more of an effect, which may be the result of less gravity.

From the start of the level, look to your left for an Elite. To the left of the elite there is a tunnel. Head into the tunnel and go straight until you reach a cliff. Now turn left and follow the cliff till you reach a rock wall. To the right of the wall and the cliff is a narrow passage, skull is at the end of that passage.

Cheat: Thunderstorm Skull
Difficulty: Legendary
Level: Cairo Station
Word: Thunderstorm
Effect: Makes Covenant "silver" and More Difficult

It’s past the two loading docks past the armory type place and in the next big room. It’s in the very highest location in the room. It’s under a trash can, I hit it out of the way and its just laying there.

Cheat: Mythic Skull
Difficulty: Legendary
Level: Sacred Icon
Effect: Unknown

After coming down from a piston, about halfway through the level, you’ll come to a room completely filled with Flood fog. Go into the room and you’ll see a stack of crates. Jump on top (while cloaked would probably work better, so the Flood don’t notice you), and across to the next highest level. If you look in the last hole in the wall, you’ll see the skull in with a dead Flood.

Unlockable: Blind Mode
At the beginning of the episode Outskirts, go through the first opening but do not head down the ramp. Instead, jump up onto the flourescent lamps over the doorway. From there, you can jump-crouch-jump onto the sloped roof to the left (jump and hold the crouch button at the peak of the jump to get onto the ledge).

Once on the rooftop, look for a narrow alleyway directly to your left. At the end of the alleyway are some grenades and a skull. Picking up the skull (hold the X button) will unlock blind mode, which removes all traces of your HUD from Halo 2 single player. To get them back, save and quit. Then choose Cairo station, save and quit and then choose the level Outskirts.