Halo2
* Foundation multi-player map

Successfully complete single player mode on any difficulty setting to unlock the Foundation multi-player map. Note: There is a glitch that prevents some people from unlocking the map as it was originally intended. The way it has been done successfully is as follows: Successfully complete single player mode on any difficulty setting. Create a new profile. Begin a co-op game on the last level with the newly-created profile with the second player. When you reach a section where you fly a Banshee, the new profile must perform a barrel roll and a loop-the-loop. Finish the campaign and the new profile can access the Foundation map when hosting split-screen, System Link, or Xbox Live games. Alternately, if you have Xbox Live, go to the Microsoft Content download menu. Then, download all recently updated content. Go to a game menu. Go to change the options, then change the map. It should be at the very bottom.
* Infinite ammunition

Take out either a battle rifle or a shotgun. Shoot yourself in the foot until you die. Next, dual wield SMGs, and repeat. If done correctly about four or five times, you should no longer have to reload, and have unlimited ammunition.
* Infinite ammunition or power

This trick requires levels that have either Covenant or Marines following you. If you have a powerful weapon that has very limited power (for example, the energy sword, or Covenant sniper), or weapons that are very powerful (for example, Human sniper or rocket launcher) give them to the A.I. following you. As they use them, the weapons will never run out of power or ammunition. Also, they can use them very well.
* Infinite ammunition in campaign mode

To do this trick, your weapon must be reloadable and have at least one clip in it. When your weapon has no shots remaining, before you reload, switch to your other weapon. Find an ally that you can switch weapons with, then quickly switch to the weapon that needs to reload and swap with the ally. If done correctly, you will see your ally reload the weapon. Swap your weapon back to see that your clip is now full, and it did not take away any ammunition.
* Have the same primary and secondary weapon while not dual wielding

This trick can only be applied to weapons that can be dual wielded. For this trick to work, you need four dual wielding weapons in one place. Two or three weapons of the total four weapons must be the same, but remember a minimum of two of same weapon is necessary in order to have same weapon for both primary and secondary slot. For example, have two needlers, an SMG and a plasma rifle. To get two needlers, carry one needler as your primary weapon then select anything else but the needler (such as the SMG gun) as your secondary weapon. Note: You cannot select the same weapon as your secondary any way. Dual wield plasma rifle with the SMG then go to the needler that is on the ground, hold X, and substitute the second needler with the SMG gun. Then, throw the plasma rifle away by pressing B. You are left with the Needler as both your primary and secondary weapon.
* Using a destroyed machine gun

You can use a destroyed machine gun; for example, in Zanzibar after you fire a rocket to one of the turrets on the left and right on the main base. Just go back to them and the screen will prompt you to hold X to operate. This can be useful during heated sessions.
* Hijack a Bansee

Wait until a Banshee drops quite low (but you still cannot reach it). Jump before doing it. If it does not say "Hold X to board enemy Banshee", press X regardless. You might not see Master Chief leap up and hit the Elite (or other alien) out of the Banshee. Do not go too low, and drive slowly because the Elite might kick Master Chief out.
* Hijack a Wraith

Go near a Wraith and press X. Then, press B a few times. Instead of throwing a grenade, just hop in. If this does not work, throw a grenade in the Wraith.
* Banshee tricks

When in a Banshee, press A and a direction on the Left Analog-stick. When in a Banshee, hold A and press Left Analog-stick Down. The Banshee will do a backflip. Additionally, to do tricks in a Banshee, press Left or Right on the Left Analog-stick and hold A to do a barrel roll, or hold Down + A to do a loop.
* Ghost tricks

In multi-player-mode, turn on all vehicles and go to a place with open space. Get in a Ghost and find a tank. Go towards it as fast as you can. You will flip and do different things, depending on where you hit the tank.

Go to any level (Metropolis recommended, when you have to get on the Scarab). Back the Ghost up to the side of the bridge. It will start hopping up and down.

Chose a level with the yellowish glowing boxes that blow up (Headlong or Waterworks recommended). Get in a ghost and boost into one of the tiny boxes and you will be sent flying. You can repeat this as many times as desired, or you can pile the boxes and be blown sky high.
* Spectre tricks

When using a Spectre, go at top speed and hold A. You will do a wheelie for about three to four seconds. This is useful when climbing up walls or going over short walls.
* 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.

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.

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.

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.
* 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.
* 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.
* 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.

* 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.
* Destroying a Ghost

To destroy a Ghost in one hit (sniper rifle) or three shots (battle rifle), look on the left side of it, just under the driver's seat. You will see a gas tank of sorts. If you shoot that directly, the Ghost will explode with one hit or one burst from the battle rifle.

One of the best ways to take down a Ghost is with a sniper rifle. Wait until the Ghost is facing away from you and open fire at the pilot. If the pilot does not die, the Ghost may explode, because it is very vulnerable in the back.
* Destroying a Wraith

Besides boarding, there is one other reliable way to take down a Wraith in single or multi-player mode. Get a Ghost and hit the booster until you are right up against the Wraith. Then, circle around to the back of it and open fire. By the time he has fully turned around to get a bead on you, he will probably be dead. If he tries to get out, you can simply pick him off as he is climbing out. Note: This may not work as well in single player mode, as the Wraith has anti-infantry plasma cannons.
* Next generation Warthog launch

This trick is reminiscent of the Warthog launch from the original Halo, but uses different methods. First, start a split screen multi-player game with just yourself on a map that has any explosive boxes (Headlong or Waterworks recommended). Then, find any of the explosive boxes and gather them in a pile near one end of the map. You can move them by pushing against them or meleeing them. However, do not melee them more than once or they will explode. After you have gathered enough, park a Warthog over them slowly and fire a rocket at one end of the Warthog. Depending on how many boxes you gathered, the Warthog should go incredibly far. Note: This takes a lot of skill and time, and should only be done if you have nothing else to do.
* Rewards for straight killings

The following is a list of rewards you get from killing people without dying once. Note: After 25 it starts over again with "Killing Spree".
5: Killing Spree
10: Running Riot
15: In The Zone
20: Unreal
25: Unfreaking Believable

* Melee combo

When caring an item (bomb, flag, etc.) quickly press Melee, X, Melee to perform a combo melee attack. Continue pressing Melee, X, Melee, X, etc. to make the combo continue indefinitely.
* Melee, shotgun, melee combo

While equipped with shotgun, get in close range and press Melee, X (reload), Shoot, Melee. Note: You must press X immediately after the first melee is finished.
* Plasma rifle, melee, shoot rage combo

While holding the shoot trigger, press Melee, and immediately after the hit, press X (which instantly continues you back into shooting). Note: This can be done as long as you do not overcharge the plasma rifle.
* Double whack energy sword combo

When using an energy sword, press Melee, X, Shoot. This combination can happen very fast.
* Infinite energy sword ammunition

When the energy runs out, do not trade it for another weapon. When you get to the next level, try to use the sword. The ammo will be at zero but you will do full sword damage instead of melee damage and can do sword moves.
* Instant kill

To instantly kill any enemy except Hunters and Bosses, hit them in the back with any weapon.
* Easy kills

The plasma sword is one of the most deadly weapons in the game. However, there is a way to make it deadlier. If you are walking up to someone, you will see the aiming reticule turn red. If you press the trigger or B, you will deliver a deadly lunge that can kill almost anything in one hit. To make this even deadlier, before you reach your enemy jump and keep aiming at him. When the reticule turns red, you will still be in the air. As you are in the air, press the trigger or B and you will lunge forward in mid-air. This is more deadly because you are above himm and his head is the closest thing to you when you are in mid air.

Get two Magnums (pistols) and shoot one trigger at a time. Do not use against the Flood, as it will backfire and kill you.
* Sword cancel

To sword cancel, rapidly press B + X. This will let the sword swing wildly and is also a good way to shock opponents. To swing your sword at an enemy but not hit them (canceling your attack) press R + X. This will only work when you are locked on an enemy.
* Faster reload

When reloading a gun, press melee immediately after the ammo is reinserted into the gun, press X. This enables you to shoot and/or zoom instantly. This works for any gun that uses ammunition.
* Accurate SMG Dwing

When DWing SMGs, press one shoot trigger at a time simultaneously. This disables the reticle/aimer from going upwards. Note: This also works on other DWings.
* Lock on with rockets

To lock on with rockets, target a person, vehicle, etc., then hold R until it says that it is locked. The red reticle will follow the item. Release R to fire. Additionally, while using a rocket launcher, you can lock-on to the following items: turrets, vehicles, and the Phantom's plasma cannons (Covenant Dropship's turrets). To lock-on to those objects, aim your cross-hairs at the object. By doing this, your rocket launcher's cross-hairs should have four red squares on the corners. Then, hold Fire so that the rocket launcher will fully lock-on to the object. While this happens, the lock-on system of the rocket launcher should make a few repetitive beeping sounds. After the beeping sounds have ended, the cross-hairs should be completely red and ready to fire. Release Fire and your spiraling heat-seeking rocket launcher missile will go to the target.
* Switch grenade types

If you have picked up a frag grenade and a plasma grenade, press Black to change from one to another.
* Practice with the sword

To get some good practice in with the sword, you must have two players, both with swords. Practice hitting each other. This is useful for combat with the Royal Elites.
* Flying sword

Have the sword when an enemy is very close. You can jump and do it, or run and jump to them, then press B. This is a one hit kill for Flood, and a two hit kill for some Covenant and the shield Flood.
* Extra ammunition with dual wield weapons

Have two dual-wieldable weapons (for example, a Needler and an SMG), but do not have them out at the same time. The Needler would be the weapon that you want extra ammunition for. 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 will now have three Needlers, and have three times the ammunition

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