Halo: Combat Evolved Cheats

Right click the Halo shortcut on your desktop, and go to properties. On the shortcut tab, add "-screenshot" without quotes to the end of the "Target" box. Remember to put a space before the dash. Click OK, and then run Halo using that shortcut. Once Halo is up and running, you can press the Print Screen key on your keyboard at any time to take a screenshot. The file will be placed in your "C:Program FilesMicrosoft GamesHaloscreenshots" folder in TGA format. You can use QuickTime to open it.

IMPORTANT NOTE: Once you exit Halo and open it again, any previous screenshots will be overwritten, so you have to copy any pics you want to keep to another folder.

Immediately before you go off any high drop, send your vehicle into a 360 circle turn. This works best with the Warthog or Ghost. You can fall an incredible distance and receive no damage.

Right when you start the part of the level called, "If I had a super weapon..." (about 2/3 of the way through the level), you are supposed to get to the top of the pyramid structure on the other side, and the way the game wants you do it is to get all the way to the bottom of the pyramid and fight your way to the stop. You can save lots of time by using the following trick: as soon as this portion fo the level starts, run out onto the bridge that connects the two sides of the chasm and get into the nearest Banshee. You have to do this very quickly, or the Elites will take them first, and ruin your chance to get it. Once you're in it, just fly your way to the top of the pyramid structure and save about 20 t o30 minutes of time.

This should work for all guns that can reload except for shotgun.
Reload the gun, as soon as you see the clip into the gun animation, either switch guns or melee. The reload would save you good time.
Works in all setting, including multiplayer.

Access All Levels
-----------------
1. From Halo, select Profiles and create a new profile eg All_Levels
2. From Windows, locate the 'checkpoints' directory for the newly created profile. You will find this in the My Documents folder,
eg
D:Documents and Settings...My DocumentsMy GamesHalosavegamesAll_Levelscheckpoints

3. In this directory create a text file called checkpoint0.sav with the following text
0,0,0
0,0,0
0,0,0
4. Repeat the previous step until you have 10 files named checkpoint0.sav ... checkpoint9.sav
and for each file change the first number on the first line to indicate the level ie
0 The Pillar of Autumn
1 Halo
2 The Truth and Reconciliation
3 The Silent Cartographer
4 Assault on the Control Room
5 343 Guilty Spark
6 The Library
7 Two Betrayals
8 Keyes
9 The Maw

eg for 'The Maw' level you will have a file called checkpoint9.sav with the following text:
9,0,0
0,0,0
0,0,0

5. From Halo, select Campaign and Load Game. You should now have access to all the main game levels.

Towards the beginning of the game, there is a way to bypass the two weapon limit and carry three weapons at once. On the first level, make your way to the bridge. After speaking with the captain, quickly run out of the bridge before the chapter name disappears. If you were fast enough, the checkpoint at the door will not trigger. Now run to the mess hall and get your Assault Rifle and another weapon. Now, run back to the bridge and trigger the checkpoint. When you go back towards the mess hall, the pistol will appear in your hands, and you will be carrying three weapons instead of two. Each gun reloads and exchanges normally. Note: This only lasts for the first level.

In the fifth level, at the beginning when you are released of the pelican, immediatly press ''e'' to get back onto the pelican and continue flying with the ship. But eventually you will die.

There is a room inside of the main building (the one that houses the Silent Cartographer itself) that has its door's lock when you come near (this normally forces you to take a serious detour to another building on the island to unlock these doors). Drive the warthog you recieve from Foehammer inside this building and as soon as you get inside the room DRIVE!! If you did it fast enough you can get the warthog between the doors. The doors will move in and out trying to close infinitly but can't because the warthog blocks them. Drive forward as far as you can and get out. You just skipped the giant detour! You can get back to the other side by getting back in the warthog, backing up as far as possible and getting out again. Another bonus to this glitch is that there will be a gold elite that won't move at all on the other side of the door. He can be killed or you could just leave him because he respawns when you have to come back through the door after activating the Cartographer.

Apparently, the guys at Microsoft/Bungie/Gearbox have a good sense of humor, and they like Green Day.

On the title screen, click Multiplayer, and put your mouse pointer over the "Edit Gametypes" option. Look at the specs that are being pointed out on Master Chief's suit.

-The one pointing at his chest says "All your base are belong to us," which we all know came from Zero Wing's horrible translation.
-Another one pointing at his thigh pad says "Sometimes I give myself the creeps sometimes my mind plays tricks on me," which are lyrics from Basket Case by Green Day.

Warning! This cheat may require you to start the level again.
On the last level(The Maw) when Echo 419 gets shot down, go down aways until you see a tunnel on your right. Get out of the warthog and go through the tunnel on the right. You should be in a corridor with another corridor to your right. Go there. In this corridor there should be a grunt. He won't shoot you or anything. Go up to him and see what he has to say.