Instructions
Log on to Hacks4Games to download the coded wall-hacking file and save it to your desktop. Open the file labeled "d3dx9_26.dll" then execute the file. As long as you have a copy of "Halo: CE" running, the file will automatically overwrite existing data and allow for the wall hack.
Sign in to a multiplayer "Halo: CE" game under your profile. Once loaded, you'll automatically spawn into a battle in progress somewhere in a predetermined environment from any of the game's campaigns, armed with a rifle, pistol and two types of grenades: shrapnel and plasma. Run to a safe hiding spot behind any rock or in any alcove and look around.
Verify the wall-hack was executed properly: the telltale sign is that all other players currently around you will glow red, thus allowing you to see them through any solid structure in the game. Shoot through these structures with either of your firearms to kill off enemies, but keep in mind grenades cannot pass through objects, so thrown grenades will bounce back at you.