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Players can unlock a different ending, learn to reload weapons faster, enter a secret cave and display fireworks. You can also make getting through the first Halo game easier by using the codes listed below.
You can unlock an alternate ending to Halo by defeating the game in legendary mode. The new ending sequence is longer than the ending on other modes, but it's also more fun for those that really enjoy Halo.
All weapons in the game, with the exception of the shotgun, can be reloaded more quickly with some simple Halo cheats. Pick up the weapon you want to use. Press X and then press B to enter melee mode. Switch back to the original weapon and you'll find yourself reloaded.
The Halo mission aboard the Pillar of Autumn allows the Master Chief to wield three guns at the same time. How do you do this? Easy, use these great little Halo cheats: Play this mission until you reach a pistol. Pick up any two weapons with the exception of a pistol and go meet the captain at the designated time. Pick up a weapon after meeting the captain and you should be able to use three guns throughout this level.
You can get through the fifth level of Halo without having to face any Covenant enemies. You must play Halo in cooperative mode to use this cheat. When you reach the first bridge in the fifth level, go down the ramp. Look at the side of the mountain. Run into the mountain until you find a spot to land. You will die doing this. Have your partner slam into the mountain as well. Repeat this procedure until you come to a spot where a squad of marines waits for you with a jeep. Use the jeep to get through the rest of the level.