Halo 2 cheats: Multi-player

Note: Button presses are described in Xbox version format. Use the equivalent key on the PC keyboard when playing that version.

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Stealing vehicles:
When playing a multi-player map with vehicles, you can steal vehicles such as the Wraith from your opponent. Approach the vehicle while holding X. Note: This removes your opponent from the vehicle only; you must press X a second time to board the vehicle.
DuffMan5128.

To hijack a Wraith, you must get up close to it by first destroying the side guns. You will get a message to press X. Do so, and you will be hanging on the side of it. Then, tap B to punch the door in. Next, press L and throw a grenade in. Jump off and go back in by pressing X, and you will now be driving the Wraith.
Chris Berardi.

Use the following trick to knock enemies out of vehicle safely. Note: This only works with a fast moving, non-flying vehicle. First, stand by a wall or something that they can crash into. Try to get the opponent to run you over, then jump out of the way after about a second of contact. He should then crash into the wall. When he does, go directly next to it and hold X. You should now be in the vehicle.

When you board a Wraith of Scorpion tank, the "B to melee" message will appear. Melee until the cover is knocked off, then continue punching. This will kill the driver without damaging the tank.
Daniel Bandor.

Snipe from vehicle:
Piggyback on a Banshee. Before one member of your team gets into the Banshee, jump on top of the Banshee's pilot cover. When you get in, you can just stand on top of it. Only make turns with the Right Analog-stick. They are slower and do not tilt the Banshee. More than one player can stay on top of the Banshee. This provides extra fun if you want to do aerial tricks with friends by jumping from Banshee to Banshee.
master cheif the second jr.

This trick requires a friend with a sniper rifle and a Banshee. Get in the Banshee and lay it right side up flat on the ground while still in it. Once you are ready, have your friend jump on the top of the Banshee. Make sure he is in the middle (the large part). Then, slowly ascend or take off and fly. Do not boost. If you done correctly, your friend will be standing on top of the Banshee with the sniper rifle. Once you cannot ascend higher, fly around and have your friend snipe enemies. Be careful not to let your friend fall off. To prevent this from happening, have him watch both your screen and his screen. He should use your screen to align his footing on the Banshee and his screen to kill the enemy. Also, when you ascend he must move forward slightly and do the opposite when descending to prevent falling.
Jolly Roger.

Piggyback ride on vehicle:
With almost any vehicle, you can get a piggyback if you are not skilled at driving or need a fast ride when someone on your team is already on a Ghost. This also works with the Scorpion, Banshee, and the Warthog when you have someone in the gunner seat, when you are all far enough away from the enemy.
Meo_Meo_Peo.

This trick requires a friend, a Ghost, and lots of patience. Have your friend drive the Ghost. Jump on the front of the Ghost and align yourself with the plasma guns at the front. Now, look up. Have your friend drive but not boost. You should stay on the Ghost. Your friend's screen will scroll down and look at your feet. Thus, he will not be able to drive. To bypass this, do not turn your body and shoot "Charlie", but have your friend look on your screen and steer you.
Jolly Roger.

This trick only works in multi-player maps with the Warthog and a friend. Have your friend drive the Warthog. Jump on the Warthog on the front windshield or the back towards the turret. Have him take off quickly. If done correctly, you should stay on.
Jolly Roger.

Ride on Scorpion tank's turret:
This trick requires a friend and a Scorpion tank. It is slightly difficult to perform and requires patience. Have your friend commandeer a Scorpion tank. Find a place where you can work in peace. Jump on the tank, then jump on the top of the turret. Adjust yourself so that you are on the middle to rear part of the turret. Have your friend gun the gas pedal and you should stay on the top of the turret. If done correctly you can now stand on the turret, even if it turns.
Jolly Roger.

Two to four players on Ghost:
This trick works best at Coagulation or Waterworks. Before the pilot gets onto the Ghost, have someone climb onto the engine. You can also have two more people jump on the wings, making it a total of four people on one Ghost. This trick creates a heavily armed aircraft that is useful for team games. Make sure the pilot does not accelerate hard or the people on the wings will fly off.
Drgonknight06.

Vehicle explosions:
In a multi-player level with vehicles (Ghosts recommended), stand in front of one of those barrel things that explode. Wait until someone in a Ghost sees you, throws it in turbo. and tries to run you over. At the last moment, jump out of the way. If done correctly, the vehicle will shoot past you, fly into the barrels, and explode; killing the driver instantly with a huge explosion.
Bobby Mcdermott the biggest hurri-fan.

Send tanks flying:
While playing on a map with two Scorpion tanks available (Coagulation recommended), have a friend drive his or her tank up against a canyon wall until it flips upside-down, and your friend falls out. Drive your tank over to your friend's tank. Face the side that looks like a ramp. Line your tank up and start driving up it until one is on top of the other. While you are still in the top tank, have you friend walk over to the bottom one. The "Hold X to flip tank" message will appear. Once flipped, the bottom tank will send the top one flying high into the air (sometimes above the level), spinning at incredible speeds. After awhile, the tanks may start to catch fire and wear-down.
Mike.

Rewards for straight killings:
The following is a list of rewards you get from killing people without dying once. Note: After you get 20 kills, every five kills you get in a row will result in another overkill medal.
Nick Corona, cfreemon, Billy Bob, FatalhitX, and Jacob Walski.

5: Killing spree
10: Running Riot
15 Rampage
20 Beserker
25 Over Kill (it says this every five kills after that)

Rewards for killing in four seconds:
Jacob Walski.

2: Double Kill
3: Triple Kill
4: Killtacular
5: Kill Frenzy
6: Killtrocity
7: Killmonjaro

Defeating opponent that has an energy sword:
Your best chance of killing him before he slashes you is to dual wield SMGs. When you see the enemy from a short distance, just let loose. The bullets will most likely stop the enemy from advancing and will kill him.
Hafcafraf.

Butterfly:
This trick can help get you to high places. On Xbox Live or split screen mode, go to the locatoin against a wall where you want to go. Make sure you have rockets (recommended) or a sword, then look up. Get a player to stand on your head. Make sure that person is an enemy. The player on your head needs to keep on jumping while you keep pressing X + B. You should get to the top if you balanced all the way.
Jacob Walski.

Strategic cover:
Get a Warthog and drive it to a slant or a hill. Make sure the front of the Warthog is slanted downward. Shoot it until it explodes. Do not use grenades because it can flip or turn the Warthog. Wait until it stops burning, Also, make sure one or both of the rear wheels are off. When the Warthog stops burning, place a grenade under it, at the rear. If done correctly, the rear should hang in the air slightly. If its not hanging high up enough, you can melee it up higher, making it a perfect place to hide and cover grenades. Note: This may take some practice. Also, this cover will disappear after awhile -- be careful.
Per Svefors.

When in multi-player versus mode, choose a level with at least two Warthogs. Park one in front of a wall, then ram the other one into it. Keave a small area behind, with a small crack in between for you to fire from. Hide behind there and wait for someone to pass by. When they turn around, shoot or jump out and ambush them. Note: This works best when you are either the same color as the Warthogs or the wall, or can get very close to the Warthogs. Also, try to use this on a small level.
cody Briggs.

Intimidate:
After receiving Double Kill, Killing Spree, Running Riot, Beserker, or Over Kill, intimidate the opposing players by finding your team partners and having both you and your partners repeatedly crouch and release to make it look as if it is a victory dance.
fayelandrum.

Stealth:
Stealth is a powerful ally. If you can sneak up on your opponents from behind or on the side, you can deliver a deadly point-blank attack that if done correctly, will kill them before they can react. The best way to surprise an opponent is from above, as when they look behind them there will be nothing there. The best way to do this is get up on a crate, rock or something where you can ambush an enemy from above. Have a shotgun or an energy sword with you. When the enemy gets directly below you, shoot them in the head with the shotgun. If this does not kill them, jump down and melee them while in the air. If you are using the energy sword, wait until the enemy gets close and the crosshair turns red. Then, lunge attack to kill them instantly. By doing this you can rain down death from above and kill opponents without them even knowing what hit them. This strategy works best in smaller enclosed maps, but can also be put to effective use in the bigger maps.
seth fieldmouse.

2 on 2 on 2 on 2 on 2 on 2 on 2 on 2:
Make a new Slayer game, and set the active players to two. Leave most selections at default, except turn off active camo and overshield. Set the starting weapons to the battle rifle and the shotgun. Turn off all vehicles except for two Warthogs, and turn off gun emplacements. Turn on teamplay, and turn off team switching. Set the betrayal penalty to 5 seconds. Play at Coagulation. This should allow you to have eight teams of two people each, making for some really fun teamwork games. If it does not, play with the active players setting until it works.
fancy pants.

Energyball:
Go to the Colossus arena and have player two stand next to the middle conveyer belt, and player one stand on the platform that shoots you upward and remain still. This will work with energy swords or any other heavy weapon. Have player two hit a barrel on to the conveyer belt and watch it fly up. Have player one lines himself up with the barrel and hit it with a melee attack.
cny16753.

At ease position:
While in a multi-player game, press D-pad Down. To other players, you will have your weapon lowered or down to your side. This may help if you are on your own turf and run into one of your friends right around the corner.
Meo_Meo_Peo.

You can hold your gun down by making sure you have no grenades. After tossing them away, hold L and you will hold your weapon down. You will not notice this on your screen, but other people will see you do it. This does not work with the beam sword.
Greg Porter.

Change splitscreen orientation:
To change the screen orientation in a cooperative game from horizontal to vertical, enter the Xbox console settings and change the video to widescreen. On a regular display, this will change the splitscreen from horizontal to vertical.
Doro626.

Troop transport:
This trick works best in Coagulation. Get the Banshee. Before the pilot gets in, get four people on top; two on the canopy (top) and two on the wings (preferably the closest part to the cockpit). Then, let the pilot get in. Make sure he does not boost or you will all fall down. Also make sure he does not do sharp turns. An additional benefit is that the Banshee has extra fire power. Note: This will work better in capture the flag. It is also more effective to have at least five people on the team.
stojak.

Killed by Guardians:
Create a multi-player variant where you have no shields, a battle rifle as your primary weapon, and a magnum as your secondary weapon. Start playing in any level. Note: You can do this with only one person. Take out your battle rifle, aim it at what you think would be head level, then start running forward and press R(2), Y. You will take out your magnum and die. The game will say that you were killed by the Guardians and your score will not go down.
Imamcoool.

Blood Gulch reference:
Go to multi-player mode and scroll to the Coagulation map. Read the description. It will describe "a bloody gulch".
CoolCarsandSons.