Halo 2 (Xbox)

Easy way to kill hunters:
For this to work you have to be in two player. One person has to get a sniper rifle or a covenent. Have the other person get a weapon that has a good melee attack. Have the guy who has the sniper rifle or a covenent set up in a location were other aliens will have a hard time getting them. Have the person who has the gun go after the hunter (so he doesnt shoot the other person). While the your parter is in a melee attack with the hunter shoot it in the head or waist. You will kill it after three or four shots.
(supplied by: Hunter killer)

Another pretty easy way to kill hunters:
All you Halo freaks out there will remember in Halo:PC & CE you could simply do a little stroll to the left then shoot the hunter it is orange spot to kill it. Well that tactic hasn't completely vanished. If you get your timing PERFECT then you can simply stroll to the side and fill the orange zone with lead (preferably, lead is better than plasma) sustain fire for a short while. After doing this 1-3 times the hunter will be dead. This is especially effective with a sniper rifle. DW Smgs or Magnums.
(supplied by: danltn)

Alternate way to killing hunters:
Simply find a fixed turret, the human ones are best and give them a body full of it they will die INCREDIBLY fast. A good place to do this is near the beginning of "Outskirts".
(supplied by: danltn)

A 3rd way of killing a hunter:
When they are approaching (but not charging at you) you can simply fire a shot into their orange stomach and you will kill them with a shot each in easy.
(supplied by: danltn)

A final way of killing hunters:
Have two people one with a sniper or battle rifle or anything effective and the other with the same. Then get one player to bait the hunter. Then they can fill the hunters spot with bullets however they person behind can hit the more vunerable back area with bullets. And the effectiveness of this is that even if one person dies you will probably win and if the hunters decides to stop bashing you and attacks the other guy then you can fill he's back with bullets and he the front.
(supplied by: danltn)

How to get to the roof of the building:
1: First put warthogs on map
2: You need to team up with your enemy(it'll be lots easier)
3: Park warthog under roof hole
4: Press the jump button real fast & hold forward
5: For your enemy to get up he/she needs to aim at you with a sword & quickly press Black, Black, Black, Z & he/she will fly to you
6: Jump on each others head and jump up
7: For the next person to get up your enemy needs to do the flying thing again
(supplied by: chilpil)

Hint:
First you start on the second city level.(The level with the huge bridge). You then kill all of your guys, after killing them hop in the warthog and drive down the bridge till you get past the large hole. It should say that you passed a checkpoint. Get out of the warthog and kill your guys up on the side of the bridge, then wait for a banshee to come after you. Let the banshee shoot at you while you dodge the bullets, then steal it. Once you steal the banshee drive it over to one of the Phantoms. One of the phantoms will stop to drop off a wraith, while it is dropping it off fly to the top of the phantom and jump on to it. If you stay on it it will take you to places you normaly cant go. If you ride it long enough it will eventualy dissapear from underneath you.
(supplied by: Pardus)

Hint:
On regret level after you've just smashed the elites, go to the next bit then you will see a pile of rubble with big pengalomes. Jump and crouch and go out on platform and you will see 2 covenant carbines and 2 plasma grenades.
(supplied by: halkettddlc)

Hint:
Rocket jump across long distances with a human sniper (it also takes a sword). Zoom in x10 and slide your thumb from Y to B and hit trigger all in a row.
(supplied by: d00msday84)

Glitch:
I found a really fun glitch that can only be done in a zombie game. I call it the guardian glitch! The power of the guardians are at your fingers. When playin zomie hold a pistol (just 1) and a sword, then press Y, Y, Trigger all in a row. If done correctly it will tell the person you shoot that they have been killed by the guardians. It freeks people out, and its most affective on Foundation.
(supplied by: d00msday84)

Odd Ball In Halo 2 In Single Player:
In the level Outskirts, if you just start the level, got straight and jump above the door, and try to get on the thing to the left. (Hint: jump and keep clicking the duck botton, and you'll go higher)get up on the platform and got to the left down a narrow path. You'll see the Oddball go over it and pick it up. WARNING IF YOU PICK UP THE ODDBALL, YOU WILL BE BLIND (a.k.a. Your Health and crosshair and basicly your entire HUD will be invisable. YOU MUST TURN OFF THE XBOX AND ON AGAIN FOR THE HUD TO COME BACK!
(supplied by: Expendable)

How to get ride of weapon:
1. Can only hold a plasma pistol 2. Start charging pistol and pick up a flag or bomb. 3. Tap R while jumping to get ride of flag/bomb. 4. Now you are weaponless.
(supplied by: ninjabros)

Hint:
On the last level, after the scarab blow up the door, take a specture and drive it off the cliff, you should not die. Then take the specture all the way around to the back of the control room. There should be a narrow ramp that go to the part on top of the door, then drop down to where you were suppose to land the banshee. Drive at top speed through the door, move aroung a bit and after some effort, you should get through. Kill the brutes then through the cut screen. When the cut screen ended, run back to the specture and get it to Johnson, if the sarge doesn't get in, throw a plasma grenade at him and he should run off the platform. Another one will respawn and he will get in, make sure you are in the driver seat when he does, then another will soon respawn and jump in, then another. If you get out, kick one out and get back in the driver seat, the newly respawn one will jump in, letting you have two or more guy on the platform. With several snipers shooting at him, the last boss will never stand a chance.
(supplied by: apocalypse 343)

Hint:
This is one of the many hidden facelike markings in halo 2. In the multiplayer level, Beaver Creek, there is a tree by the begining of the ramp to get the pistol or sniper rifle. You should look at the tree like th