Here are some cheats for Halo 3 Xbox 360 version. Some of them are really cool and worth trying yourself. So enjoy and shoot me a comment if you know more cool cheats.

Show coordinates

During a local match or replay, click Left Analog-stick + click Right Analog-stick + LB + RB + Down/Right.

Easier Legendary mode

If you are playing alone on the Legendary difficulty setting, turn on an idle second player to stay behind. If you die, you will respawn instead of restarting.

Toggle panning camera

During a local match or replay, click Left Analog-stick + click Right Analog-stick + LB + RB + Up/Left.

Lower weapon

During a local match or replay, click Left Analog-stick + LB+ RB + A + Down for approximately three seconds. If done correctly, your weapon will not be visible on your screen. When you shoot, your weapon will be raised again. -From: Dirttbagg and darthvader302

Katana

Successfully complete all achievements (1000/1000) and find all Skulls to unlock the Katana.

Recon armor (Mythic Map Pack DLC)

Get the three “Vid Master Challenge” achievements in the “Mythic Map Pack” bonus downloadable content to unlock the Recon armor.

Alternate endings

There are three endings. The first ending is shown when the game is successfully completed on the Easy, Normal, or Heroic difficulty setting. The second ending is shown when the game is successfully completed on the Legendary difficulty setting. The third ending is shown when the game is successfully completed on the Legendary difficulty setting with all Skulls activated.

Super fast Spartan laser fire

In Forge mode, get a Spartan laser. Charge it until it is almost about to fire. Before you fire, turn into the Monitor. Fly around until you find a target. Before you turn back into a human, hold RT to fire the Spartan laser almost instantly (if done correctly). You can use the Monitor’s aimer to aim the laser.

Smarter respawning

When playing in Co-op mode on the Legendary difficulty setting, it is best to have one player keep their distance from the enemy at all times. By doing this, if the rest of the players die, they will respawn around the player that is farther back, rather than having to restart at the checkpoint.

Preventing lag

To clear the hard drive cache and prevent lag in Solo and Multiplayer mode, when starting the game, hold A + Up. Select “Yes” when you are asked if you want to clear the cache.

Extra grenades

In Multiplayer or System Link mode, when you kill someone, slash their dead body with the Energy Sword for more grenades come out of it.

Recharge shields quicker

If your shields are down in Forge mode, press Up and they will recharge.

Reload quicker

If you are a Spartan or Elite and your ammunition is low, press Up again while reloading to instantly reload.

Melee faster

To melee quicker, press B, then press Y(2), B rapidly.

Stay zoomed in

If you are zoomed in as a Spartan or Elite and turn into the Monitor, press Up to turn back into your character and still be zoomed.

Crouching

To crouch, click and hold the Left Analog-stick. While crouched, you will not appear on motion-sensors. This is helpful in Multiplayer mode when you do not want the other team to find out where you are.

Play as the Oracle

At the Forge lobby, press Up to turn into the Oracle. You can pick up items by pressing A when you see a green hand.

Exploding grenades

Throw a grenade in the air, and shoot it with a sniper rifle.

Illegal service tags

If you go to “Appearance” and try to change your service tag to “I17″ (Master Chief’s number is 117), the game will not allow it. It will say that the tag is reserved for use by the UNSC.

If you try to use “A55″ as your service tag, you will be told that it cannot be used under UNCS regulations and rules.

Driving vehicles through invisible walls

In certain levels in Campaign mode, you may want to take your vehicle through most of the level. However, there are invisible walls that keep the vehicle from moving past where it is needed. To pass through this, drive your vehicle through the doorway, gate, tunnel, etc. where the invisible wall is located. Just before you go through it, jump out and let the vehicle pass through the wall. This allows you to take the vehicle through the rest of the level if desired.

Breathing under water in Sierra 117 mission

At the end of the level, when the Pelican arrives after you have rescued Johnson, it destroys the two Covenant ships, one being above the water just outside of where Johnson is held. The other one is above the water in the place just before the Pelican lands. You can climb in. Once the Covenant ship is destroyed on the side where it picks you up, the debris that remains will float on the water. Jump onto it, and let it sink. After that, all you can do is just jump from one piece of debris to the other. If you touch the ground, you will die.

Monkeys with teddy bear in Sierra 117 mission

After you come into contact with the snipers in the woods, follow the left rock path to find a strange family of monkeys holding a teddy bear.

Hidden area in Tsavo Highway mission

After the part where you exit your Warthog, jump across the bridge, and kill the Brute and two Grunts that are attacking your men. Turn directly around, facing toward where you came from. Look to your left, and you will see a structure. Go up to the wall on the structure, and look to your right. There should be a pathway. Follow the path until you get on top of a bridge-like structure. There should be some dead UNSC Marines, a sniper rifle, and some other ammunition.

Crossing broken bridge with vehicles in Tsavo Highway mission

When you reach the bridge with a Warthog or other vehicle with barriers, normally you cannot cross this area. However, back in one of the buildings before the bridge is a Grav Lift. Get it, and throw it a bit before the break in the bridge, then run the Warthog or any other vehicle over it. This will make the next area much easier, especially on the Legendary difficulty setting.

Easy “Used Car Salesman” achievement

Go to the beginning of “The Ark” mission. Make sure you have a guest or a friend to help. Continue the mission until you reach where the crashed Pelican is found (after the first terminal). Kill the blue Brute, and grab the rocket launcher under the crashed Pelican. Continue to where the choppers are located. As you are moving, a Prowler will drive by. Ignore it because it will soon stop and abandon the Prowler leading to failure of the achievement. Another Prowler will follow. Have your guest or friend shoot it twice with a Brute Shot, then shoot at it with your rockets to get the achievement. Note: If you are by yourself, do the same thing, but instead of using a Brute Shot, throw a grenade in front of it. Then, shoot it with the rockets.

(original cheats by: http://cheatcc.com/)

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