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

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

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

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

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.

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.

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.

Easy experience in Multiplayer mode
Note: This trick requires four active accounts on your console that are all able to play on Xbox Live. Enter the matchmaking lobby, and choose "Social", then "Rumble Pit". Sign all four of your accounts in the lobby. In free for all modes, you have to be in the top three to earn experience points. Start matchmaking, and it should find two additional players. Once the game begins, you can simply do nothing. Once the game ends, all four of your accounts will tie for third place, giving all of them easy experience points. -From: Brandon Adkins

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.

Terminal locations
The following is a list of all seven Terminal locations. To accomplish the "Marathon Man" achievement, when you find each Terminal, press RB to view the journal. The screen will eventually start to turn red. Wait until it turns blue again and a new entry will appear. You need to view both entries in all Terminals for it to count towards the "Marathon Man" achievement. -From: Jared

Infection game type.

Multiplayer ranks
Get the indicated number of skill and experience points to advance to the corresponding rank. Note: You can skip ranks once there is a set skill requirement. For example, you can go from Lieutenant Grade 2 (Skill: 10, EXP: 85) straight to Captain (Skill: 20, EXP: 100)

1. Recruit: Skill: 0, EXP: 1
2. Apprentice: Skill: 0, EXP: 2
3. Apprentice Grade 2: Skill: 0, EXP: 3
4. Private: Skill: 0, EXP: 5
5. Private Grade 2: Skill: 0, EXP: 7
6. Corporal: Skill: 0, EXP: 10
7. Corporal Grade 2: Skill: 0, EXP: 15
8. Sergeant: Skill: 0, EXP: 20
9. Sergeant Grade 2: Skill: 0, EXP: 30
10. Sergeant Grade 3: Skill: 0, EXP: 40
11. Gunnery Sergeant: Skill: 0, EXP: 50
12. Gunnery Sergeant Grade 2: Skill: 0, EXP: 60
13. Gunnery Sergeant Grade 3: Skill: 0, EXP: 150
14. Gunnery Sergeant Grade 4: Skill: 0, EXP: 300
15. Lieutenant: Skill: 10, EXP: 70
16. Lieutenant Grade 2: Skill: 10, EXP: 85
17. Lieutenant Grade 3: Skill: 10, EXP: 200
18. Lieutenant Grade 4: Skill: 10, EXP: 400
19. Captain: Skill: 20, EXP: 100
20. Captain Grade 2: Skill: 20, EXP: 150
21. Captain Grade 3: Skill: 20, EXP: 300
21. Captain Grade 4: Skill: 20, EXP: 600
22. Major: Skill: 30, EXP: 200
23. Major Grade 2: Skill: 30, EXP: 300
24. Major Grade 3: Skill: 30, EXP: 600
25. Major Grade 4: Skill: 30, EXP: 1,200
26. Commander: Skill: 35, EXP: 300
27. Commander Grade 2: Skill: 35, EXP: 450
28. Commander Grade 3: Skill: 35, EXP: 900
29. Commander Grade 4: Skill: 35, EXP: 1,800
30. Colonel: Skill: 40, EXP: 400
31. Colonel Grade 2: Skill: 40, EXP: 600
32. Colonel Grade 3: Skill: 40, EXP: 1,200
33. Colonel Grade 4: Skill: 40, EXP: 1,800
34. Brigadier: Skill: 45, EXP: 500
35. Brigadier Grade 2: Skill: 45, EXP: 1,000
36. Brigadier Grade 3: Skill: 45, EXP: 2,000
37. Brigadier Grade 4: Skill: 45, EXP: 4,000
38. General: Skill: 50, EXP: 600
39. General Grade 2: Skill: 50, EXP: 1,200
40. General Grade 3: Skill: 50, EXP: 2,500
41. General Grade 4: Skill: 50, EXP: 5,000

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.

Defeating Flood
When you kill any Flood that can come back to life by the infection forms, hit the body and it should break apart. This saves ammunition.

Defeating Wraiths
To easily kill a Wraith and save time and ammunition, aim at the little circle on its back. It only takes approximately five to ten shots to kill it this way.

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.

Dribble Skull in Crow's Nest mission
At the beginning of the mission, grab the Skull on top of the large pipe near the ceiling before you pick up any weapons. This is easier in Co-op mode. Press RT repeatedly. This will cause Master Chief to drop the Skull, but because he has no weapons, he will immediately pick it back up, making it appear as though he is dribbling the Skull like a basketball.

Leave level boundary in Isolation multiplayer map
While in Forge mode, get as high as possible as the Monitor. Spawn a teleporter on the ground. Then, hug any wall while still being as high as possible, and spawn another teleporter. If the teleporter beneath you is lit up as it should be, turn back into a Spartan or Elite, then go through the it. You should now be outside the level boundary.

Stretchy Master Chief in Last Resort multiplayer map
While in Forge mode, move to the two Mongooses next to the building on the far side of the map from the beach. Change into the Monitor, and place six or more Fusion Coils near the side of the bridge coming out of the building. Change back to Master Chief, and stand on top of the coils. Position yourself so that when they detonate you will fly into the side of the bridge. This may require a few attempts. Then, end the game. Go to the theater and watch the movie. Play the explosion slowly by tapping A quickly to pause and restart the movie. If done correctly, upon impact Master Chief will stretch out.

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.

Leave level boundary in Valhalla multiplayer map
Go to the ocean barrier (the side with the ocean). Then, you and another player must get a Mongoose and Wraith. Have one player drive the Mongoose into the barrier. Keep accelerating, and have the other player get into the Wraith. Drive behind the Mongoose inside the Wraith, and use the boost. You must be close for the Mongoose to go through. Once you hit it, the other player must jump out once he or she is pass the barrier.

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