Halo Cheat Codes & Walkthroughs for PC 

Halo is an American military science fiction media franchise centered on a series of video games managed and developed by 343 Industries, a division of Xbox Game Studios. Halo was originally created and developed by Bungie. The original trilogy centers on an interstellar war between humanity and an alliance of aliens known as the Covenant. The Covenant, led by their religious leaders called the Prophets, worship an ancient civilization known as the Forerunners, who perished while defeating the parasitic Flood. The central focus of the franchise builds off the experiences of Master Chief John-117, one of a group of supersoldiers codenamed Spartans, and his artificial intelligence (AI) companion, Cortana. Other characters, such as Noble Six from Halo: Reach, are also introduced in the series. The term "Halo" refers to the Halo Array: a group of immense, habitable, ring-shaped superweapons that were created by the Forerunners to destroy the Flood, but which the Covenant mistake for religious artifacts that, if activated, would transport them on a Great Journey to meet the Forerunners. They are similar to the Orbitals in Iain M. Banks' Culture novels, and to a lesser degree to author Larry Niven's Ringworld concept.
Cheat codes, console commands, secrets:
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!!!

type in 11mar and you get 11marines and they have shotguns and full
ammo with the shotgun.
Cheat codes, console commands, secrets and system requirements for Halo free online.

Game description

Game Developer:
Bungie (2001–2010) Ensemble Studios (2009) 343 Industries (2011–present) Creative Assembly (2017)
Game Publisher:
Xbox Game StudiosPlatform(s)
On other platforms and consoles:
GBA Xbox