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
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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.