Unlock New Multiplayer Map in Halo 2:
Beat the single player compaign on heroic difficulty to receive the multiplayer map ''Foundation''.

Easter Eggs in Halo 2:
Blind Mode At the beginning of Outskirts jump on top of the light on top of the door with a crouch jump, then jump to the left platform. Turn to your left and go down the long dark corridor and pick up the skull; it will say blind and your screen will flash black for a while. In this mode you can not see your weapon, body, shields, ammo, or radar.

To get rid of this feature use the following method:
1. Turn off your XBOX or Save and Quit.
2. Go to Campaign and select level and choose Cairo Station.
3. Skip the cinematics and then Save and Quit.
4. Go Outskirt and your hud is back.

"Blue Screen of Death" in Zanzibar:
In the multiplayer map Zanzibar, there should be a computer on the upper level on the defense side that opens up the main gate into the base. After you activate this, the screen goes blue with the infamous BSOD.

Iron Mode in Halo 2:
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.

Envy Mode in Halo 2:
On the level "Delta Halo" on Legendary Difficulty, Progress until you reach the area during the "Push through the covenant held ruins" where you have to clear a Landing Zone for the Pelican to drop weapons. I beleive you will know you are in the right area when cortana says "there pouring out of the center building". Anyway that area has Plasma turrets along its borders. A little bit after the left side turret you will see the outline of a door in a wall, but the door has a solid rock slab in it and a rock in front of it. Jump on the rock then jump to the ledge above the door then jump on the ledge to the left. Now jump onto the building with the sealed door using grenades. Atop the building you will find two dancing elites and the "Envy Skull". Pick up the envy skull and you will be able to use Active Camoflage like the Arbiter.

Assassins Mode in Halo 2:
Submitted by: Nelson (A.K.A. - UncleBen) A skull similar to the one that activates blind mode can be found if you Start on "regret". After the first lift ride (before the first underwater elevator), grenade jump from the front awning of the lift to the ledge in front of you (the one with two turrets). Grenade jump AGAIN onto the next ledge. Make your way to the back of the building. On Easy, you'll only find the skull. On Legendary, however, 2 invisible Elites carrying swords just shake their heads wildly, ignoring you completely.

Grunts Birthday Party Mode in Halo 2:
Submitted by: Nelson (A.K.A. - UncleBen) 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.

Posters at the Old Mambassa Crash landing *after Cairo*:
After you crash land on Old Mambassa, you can see posters all around with the Master Chief from the demo and some grunt posters.

Glitches Extra Ammo with Dual-Wieldable Weapons:
Submitted by: Nelson (A.K.A. - UncleBen) First, have 2 dual-wieldable weapons (a Needler and an SMG for example), but don't have them out at the same time. The Needler being the one you want extra ammo with, have the SMG out and find another Needler to dual wield with it. Then, find yet another Needler and trade that with your SMG. You'll have 3 Needlers, and have 3x the ammo.

Give your squadmates better weapons:
Once you have almost used up your sniper rifle, beam rifle, or rocket launcher (with 1 shot left ), trade with your squadmate. Once they have that weapon, they have limitless ammo for it and can help you out immensely with the more powerful weapons. There are two points to note: if you try and trade your weapon back from them, it will still have the same amount of ammo that it had when you gave it to them and the energy sword cannot be traded with human squadmates.

Skip tough Brute battle before the end boss:
When you are flying around in the Banshee during the final level when you are giving support to your "ally". You can skip directly to the final boss sequence if you are still in the Banshee after the door gets blown open. Fly to the right of the control centre building and aim towards the bottom right and if you fly close enough you should get a white screen indicating that you have started the cutscene. When it's over you will be at the final boss without fighting your way to him.

Beat Tautarus Easily in Halo 2:
When you first start the fight, make sure Tautarus' attention is on another NPC and not you. Grab the energy sword from one of the bodies lying around and wait for his back to face you. When he does, dash behind his back and rapidly tap R, It will hurt him and not allow him to react and attack you. About 30 seconds of this kills him.

Inverted or Normal control in Halo 2:
When you first start the game and the Marine has you look at the lights it's really testing what your preference is, inverted or default. When the red light turns on, no matter what direction you hold on the stick, it will always go to the light. The game automatically records what you naturally choose. If you do a combination of both, the marine then goes in depth and eventually asks you what to set it as.

Cheat:
a,a,y,b,y,black,and white to get a jet pack that you can fly in.

411:
Here the 411 on the newest enemy that has been added to the covenant armada. They are the giant creatures deemed holy by the covenant called Brutes.

FLAMING BABY CEREMONY:
Activate blind mode in the outskirts on legendary. Go through the level killing everything with the skull only the skull. Then when you get to the part in the big city kill the marines not the covenant and don't let the covenant kill any marines you have to kill them all. Then go back where you found the skull there will be a grunt there he will say" I took this guys suit and now he is naked but anyways here is his suit. It will say on the screen hold x to get suit it is Batman's suit (sweet). Then jump through the glass ceiling in the middle on top floor of the building. When you land there will be a grunt taking a goat on a unicycle back to the top where you fell through the goat will explode shooting rockets everywhere. Jump out in front of a rocket and get hit but because you are wearing the Batman outfit it won't kill you. Now you can fly and when you shoot your gun babies comes out. Congratulations you can give birth to babies anytime now.