Halo

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Cheat mode (Custom Edition):
Start the game with the -console -devmode command line parameter. Press ~ during game play to display the console window, then enter one of the following codes to activate the corresponding cheat function. Note: You cannot enable codes in online games. Also, commonly used commands can be placed in an "init.txt" text file in the main game directory that also contains the "halo.exe". Entries in that file should be made in the same format that they are entered into the console, and will be activated automatically when the game is started.

Effect	Code
Toggle instant deaths for enemies that see player	cheat_medusa <0 or 1>
Set game speed	game_speed <0-20>
Clear console window	cls
Toggle unlimited ammunition and no overheating for human weapons and plasma weapons	cheat_bottomless_clip <0 or 1>
Unlimited ammunition	cheat_infinite_ammo <0 or 1>
Super jumps	cheat_super_jump <0 or 1>
Possess touched character	cheat_bump_possession <0 or 1>
Invincibility	cheat_deathless_player <0 or 1>
Active camouflage until shot, quit, or level ends	cheat_active_camouflage
Spawn Warthog	cheat_spawn_warthog
Spawn all power-ups	cheat_all_powerups
Spawn all vehicles	cheat_all_vehicles
Spawn all weapons	cheat_all_weapons
Teleport player to current camera position	cheat_teleport_to_camera
Save current camera location	debug_camera_save
Go to saved camera location, away from player	debug_camera_load
List player names and numbers on server	sv_players
Ban indicated player from server	sv_ban <player name or number>
Kick indicated player from server	sv_kick <player name or number>
Send message as **SERVER** user name1	sv_say <message>
Quit game	quit

GrimRipper57, The Cheatmaster, Alex Stewart, and Aj Collins.

1. Note: Use the underscore character "_" in place of spaces in your message to separate words.

W: Forward
S: Back
A: Strafe left
D: Strafe right
R: Up
F: down
Mouse: Turn
Mouse Wheel Up or Down: Movement speed

Screenshots:
Start the game with the -screenshot command line parameter. Press [Prt Scn] during game play to copy the current screen to the clipboard. You may now paste it into the program of your choice.

Alternate ending sequence:
Successfully complete the last level of the game in campaign mode under the legendary difficulty setting. The new ending features a human and alien fighting hand to hand. The human will say "Its over", and then they hug because they know the explosion will kill them both. Also, the FMV sequence of each battle scene will be slightly longer.

Alternate dialogue:
Playing under the legendary difficulty setting introduces new dialogue not heard in other modes. For example, after being massacred by a force of Grunts, Jackals and Elites, one of the grunts asks, "Can I have his helmet?". Also, your fellow Marines seem to be a bit more chatty (as well as profane).

Under the legendary difficulty setting, view the entire first FMV sequence. During the sequence, the General says things very differently when compared to the sequence under the easy difficulty setting.

Hint: Haloball: Get Warthog out of stadium:
There are two ways to do this. One is to place a Warthog in a corner, with the front facing out. Use it as a ramp for other Warthogs. The other method is to place a Warthog in a corner, then throw a plasma grenade under it, followed by a fragment grenade. When it flies up, shoot it with a rocket to knock it up to the stands. Note: Sometimes the Warthog slides off. Another rocket can knock it up farther and, sometimes prevent it from falling off.
SWATSoldier522.

Hint: LightningStrike: Banshee:
Get a Ghost at one of the bases and drive up onto the mountain. Once on it, find a way to get to the other side of the map. You will find a Banshee over there.
SWATSoldier522.

Hint: LightningStrike2: Secret room:
Go to the Red base and walk into the corner where there is a group of rocks. You will go through a secret teleporter find yourself under the bridge. Once there, look around for a trench. Get in it, and look for a small corner with a shotgun in it. Walk into that corner and you will find the secret room. There are rocket launchers, snipers, active camo, grenades, and overshields, along with a few pictures and a list of the beta testers.
SWATSoldier522.

Hint: SaberArena: Get on top of billboard:
To get on top of the billboard advertising a Warthog, face it and walk into the left corner of the map. You will teleport up to it. You will find a laser rifle. The only way off is to jump.
SWATSoldier522.

Hint: Silent Cartographer: Get to the Silent Cartographer without fighting:
You must have a overshield with you. After you open the door where the Gold Elite with the plasma sword is located, make a right. There should be an intermission sequence where Master Chief kicks a rock to see how deep the fall is. This is what you are trying to do, except land at a certain place. After the intermission sequence ends, look to the right and down. Notice that there are two platforms at the right. Position yourself and jump for the second platform, then look below. The third platform should be underneath. Look for any walls that you can slide so that you will not lose any life or shields. Slide down and go all the way to the left. You should see the Silent Cartographer and Convenant guarding at the other side. Try not to alert them. Sneak to the objective, press E, and you are done. Note: You will face Convenant when you must go back to the surface. If you have an overshield, your health will probably be at four bars and your overshield will be gone.
jdm_ae86.

Hint: Streets Of Earth City: Nuclear signs:
There are two signs in the map that will kill everyone nearby if they are shot. One is on the central tower, and the other is in the place where you find the Lifepod.
SWATSoldier522.

Hint: Streets Of Earth City: Find Lifepod:
There are two ways to find the Lifepod. One is to fly around under the map until you find the place in one of the pillars. Another is to use a teleporter on the side of one of the towers. Note: To use the teleporter, you must use a Banshee and get out while directly in front of the teleporter.
SWATSoldier522.

Hint: Multi-player mode suicide:
There are several ways to commit suicide on multi-player mode. Go to a level that has ceilings, preferably Rat Race. Get a plasma grenade, aim straight up, and throw it. Do not move. It will fall and stick to you, eventually blowing up and killing you. Another way is to have two plasma grenades. Throw the first one about ten feet from you then immediately throw another one about a foot in front of the other. Line yourself up with them. The second plasma grenade will be blown into you. Another way is to make a game play option where there are no shields and all shotguns. Go to a level with stationary Covenant shields. Get as close to one as you can with a shotgun. Shoot the shield and you will die.
Japanime6651.

Hint: Multi-player mode catapult:
Go to a level that supports vehicles. The following weapons are requred: a plasma grenade, fragmentation grenade, and a rocket in a rocket launcher. When first trying this, back a Warthog up to a wall. Get on top of the Warthog's gun (not manning it). Look at the ground in front of the Warthog. Throw the plasma grenade in front of the Warthog. Immediately throw the fragmentation grenade directly on the plasma grenade. Then, immediately shoot the two grenades with the rocket launcher. You may be hurt in the process. However, you will be propelled high into the air if done correctly. Note: You can use this trick to get on top of the cliffs in Blood Gulch.
Japanime6651.

Hint: Disappear from enemy radar (demo version):
Crouch when you walk. It is a very slow technique, but it works. It is very useful if you grab active camouflage (in the middle of the Blood Gulch map) and do the crouch technique. You will be practically invisible to any enemy radar or eyes.
edhillbilly.

Glitch: Shoot enemy through wall:
In multi-player mode, drive any Warthog close to a building so that the side of it is touching. Get in the gunners turret and turn it towards the wall. If done correctly and you are close enough, you should be able to to shoot at an enemy through the wall and not receive damage from them if they shoot back.
Nick_D.

Glitch: Grenade sticks to nothing:
Get near a Banshee when playing online. Make sure you have sticky grenades. Stand at the back where you would normaly get in. Look down at the tip (flaps or turning flippers). Throw a sticky grenade between the two flaps. It should stick in the middle then explode.
bradley stirling.

Glitch: Boarding Action: Bottom to bottomless pit:
If you fall off, sometimes you will land on a solid but invisible section of ground. Note: Once you are here, there is no way you can get back up other than to somehow kill yourself.
Neil Sen.

Glitch: Silent Cartographer: Invincible frozen Marines:
Kill all Covenant on the beach. Get the Warthog and drive into the entrance until you get to the place where they lock the doors. Park the warthog against the left wall facing the door. [Screenshot] Get out and retrieve the other Warthog (around the next side of the island to the left) [Screenshot]. Drive it around and fill it with Marines. Go back into the building were you parked the first Warthog. Go down the ramp until you get to the first landing. [Screenshot] Get out and proceed to the first Warthog. Face the gunner seat and when prompted, press Action to make him climb down. If done correctly, he should not respond. You may want to press it a few more times just to make sure. Do the same for the passenger. Go towards the second Warthog until you pass a load point. [Screenshot] You should hear them get out of the first Warthog. Go back and throw a few Plasma Grenades on them and they will burn forever. [Screenshot] Shoot them in the head and back up. They will instantly die and explode. [Screenshot]
alex bradford.

Glitch: Streets Of Earth City: Go to moon:
Get a Banshee, Pelican, or Lifepod and fly up to the central tower. Once there, freefall to the bottom of the map, which you will go through. If you do not freefall, you will not go through. If you do not get it the first time, try it again. Once out, fly toward the moon. You can also fly to the big red planet with this glitch. The moon is about twenty minutes away. Note: When out, do not fly straight at the moon or you might enter the map again.
SWATSoldier522.

Glitch: In air grenade explosions:
On any map, use two plasma grenades. Throw one, and keeping your pointer in the exact same place, immediately throw another one. The first grenade will blow up, and the second grenade will fly very high and explode in the air, which is impossible to do without using this technique. A grenade would usually explode if any shrapnel entered it, but not on this game.
camclan.

Glitch: Warthog plasma launch:
Get a Warthog and two plasma grenades. Throw the first plasma grenade under the front hood of the Warthog. Wait about three seconds then throw the other one at the windshield. The second plasma grenade with bounce off of it, and the first plasma grenade will launch the front of the warthog up then launch the second plasma grenade into the air, and it will explode.
Aviator.

Glitch: Assault On The Control Room: Suicidal Grunt:
After you get the tank and are going through the tunnels, you will reach a small squad of enemies and one Grunt asleep on the path. When you drive by, instead of jumping away from the tank it will jump in front of it and get run over. Because it is sleeping so close to the wall, it cannot jump backwards and ends up jumping forwards, killing itself under the tank.
A Sacher.

Glitch: Blood Gulch: Sniping location (demo version):
Get in a Banshee. Fly to the rock with the circle in it. At the side facing the Red base, back up into it. The tail should be facing it and physically in contact with it. Jump out and you will be on the rock. You can now snipe from there.
Ben Mourad.

Glitch: Blood Gulch: Enter rock (demo version):
Get in a Warthog. Drive to the pointy rock near the middle the map. Back up into it. The bumper should crash into it. Get into the gunner's seat and jump out. If done correctly, you should be inside the rock. You snipe people from inside. Bullets cannot effect you, but plasma weapons, explosives, and flamethrowers can.
Ben Mourad.

Get in a Banshee and fly to the side of the mountain that has a pointed edge by the Red base. Then, turn the Banshee around towards the rock. Hold [Back] and press E. Keep holding [Back] to get on the top peak to get down the other side. Slide down it. Note: Several attempts may be required.
talon briley.

Glitch: Silent Cartographer: Zombie Elite:
When you arrive to the door that you must unlock, kill the golden Elite on the other side of the door before it closes (preferably with a plasma grenade). If you successfully kill it before the door closes, when the intermission sequence occurs after you shut down the security system, you should see the body of the dead Elite, but its "ghost" will step out of the room. This is because you are supposed to kill him when you arrive to the room after shutting down the security system. If you are lucky, you will see the dead Elite, but no "ghost". On your way back out after finding the control room using the Silent Cartographer, you should meet the "zombie" Elite at the same spot. If you pay attention when you meet him, you can see that there is no body of the Elite that you previously killed.
A Sacher.