Halo

To kill a elite in 2 hits first you need a plasma pistol. find a elite and start charging your plasma pistol. aim at the elite and shoot him. he will be paralyzed for a second and have low health. run up and hit him.

You must make you own game in split screen. Then you turn off the sheild. And get a human pistol. When playing the game. Zoom in and shoot at there head if you hit him/her it kills them in one shot.

This is only possible to do in co-op mode, so get a friend to help out.

Near the end of "Assault on the Control Room", at the base of the big pyramid-type building, rush over and steal a Ghost from the two parked ones.

Get the Ghost (in one piece) to the top of the pyramid (Get your friend to do the fighting while you take care of the Ghost). Open the large blast doors, kill whatever is in your way, and keep going down the hallway.

When you reach the VERY LAST door (ie. The one that triggers the cinematic), stop. Line the Ghost up with the centre of the door as best as you can, and back it up about one or two Ghost-lengths away. Have your friend hit the switch to open the door, wait a half-second or so, and then gun it towards the door.

If your timing was right, the Ghost should JUST fit between the doors, and during the cinematic the Ghost (now without a pilot) will mow down Master Chief from behind, killing him. The cinematic will go on as normal, except for the absence of Master Chief (you will still hear his voice, though). Also, in certain camera angles, you will see Master Chief's corpse in different poses, such as tilting 45 degrees to the left with his gun stuck in the ground.

It will work more than once (I've done it three times so far), and it just looks damn funny to see Master Chief get run down by his own Ghost. Props to The Fiend for co-piloting.

If you are in a happy and silly mood try this: at the first level when the captain gives you a pistol, get out of the room to the place where you see the first grunts. kill them and go back to the captain's room and kill him. Its so funny. Cortana will say, " WHAT THE HELL ARE YOU DOING? Security to the bridge. The master chief has gone crazy". Then you will get locked inside and the troops get invincible and come and attack you because they think you are a traitor. (if you are playing 2 player mode and one of you kills the captain, the other player poofs to the captain's room and gets locked too)

In order to lower the difficulty level form legendary to heroic, heroic to normal, and normal to easy while playing, hold down back, then press left and right trigers at the same time, then press Y-A-X-B. All of this must be done VERY QUICKLY. No message will appear to show that the cheat has worked, but you will notice that the game is a lot easier.

Play through the level: Two Betrayls, until you get to the part where it says: "Final run" at the bottom of the screen. Instead of going straight forward to the battle where the Flood and the Covenant are fighting, look to the left and you will see a small hill with a large tree and a few small rocks to the left of it. Go towards the hill and jump over the rocks and go to the left of the tree that will be right in front of you. Ahead you will see a small tunnel. Get close enough to the tunnel that you are inside it a little. If done correctly, Flood will appear out of nowhere and attack you. This is suicide, because some of the Flood members that appear have Rocket Launchers.

In the level assault on the control room you can get your sniper rifle to have an assault rifle body. When you have a sniper rifle go through a checkpoint. Then you switch it for an assault rifle and as it switching save and quit. If done properly you'll be able to use a sniper only it will have the body of an assault rifle and beats like an assault rifle.

To do this you must have a plasma pistol, when you do hold down the trigger until the gun is shaking rapidly. That makes it more powerfull.

On the level 343Guilty Spark, go through the level normally. When you get to the wooden bridge where there are a couple of Jakals, kill them, but don't go onto the bridge until you do. After you kill all of them, go onto the bridge. As described in the "Yeti" cheat, if you look to your right, you will see two Flood. But if you don't look to your right and hurry across the bridge instead, straight ahead next to a bush up on a hill, a Flood will run out from the bush and run down the other side of the hill. Once you see it, watch it run away and immediatley pause the game. Click on "Revert to Saved". Then you should start back at a checkpoint after you killed the Jackals, but before you ran onto the bridge. Run accross the bridge, but keep an eye on your radar. As soon as you see allies on it, quickly jump off the left side of the bridge. You may loose some of your shield, but who cares!? After you jump off the bridge, run straight ahead. If you go fast enough, you should see a Flood run in between a couple trees and a bush. Keep going and pass through the trees. If you timed it correctly, just as you pass the trees, a Flood will run a few feet in front of you. You can try shooting it, but as soon as you kill it, it gets back up and becomes invincible. Then it runs forward, and disappears.

On the level Assault on the control room,where it says "if i only had a super weapon", there are two ways to skip part of the level. The first way is to try and get the banshees using the Sortcut technique. The second way is to fall onto the pirimid structure that slopes from the end of the level down. It is best to have full shields while attempting this trick so you don't die. You must aim yourself in the middle of the structure as best as you can. Fall, do not jump, onto the sructure. Right before you hit, crouch to prevent damage. Follow the structure to the bottom into a pit. The pit should contain a rocket launcher and a sniper rifle if you choose to use them. Continue to the top of the structure on foot or with a bonus. The end of the level will still have no enemies. It is harder to do this than it is to get the banshees, that is why it is plan B.