Cheats for Halo (PC)
In multiplayer, on Gephyrophobia, if you take a banshee, and fall to the floor, take out a fuel rod gun and shoot downwards just as you get out of the banshee. If done correctly, you should unlock a cheat profile, and from there, just play the cheat level after 'the maw' to get cheats. THIS IS SO UNOFFICIAL!!! Hint: type in 11mar and you get 11marines and they have shotguns and full ammo with the shotgun.