Section 3 ARG

The Section 3 ARG was an alternate reality game done by 343 Industries. The ARG was a campaign that spread out through Halo 4 and Halo: Spartan Assault. It was a forum-based campaign that also spread into chat groups, trailers, and even in Halo 4.

Summary
The campaign started on October 12th 2012, with a symbol appearing in the Making Halo 4: Infinity Multiplayer trailer.

The campaign lasted for two years, giving fans a look into the Office of Naval Intelligence's Section Three and also insight into the experiments they did. Users found glyphs that led to codes being discovered for use on Halo Waypoint (now only on the Xbox 360). While the users found codes, an AI that was originally meant to help them turned against them, giving the puzzles for the ARG.

The campaign ended on November 11th 2014 after Sec3OP36516, the main handler at the time, stopped posting after having a mini-forum game with the players.

Post-game
Unofficially some of the handlers came back after they left 343i, this led to some of the players opening some of the cookies that was missed during original run of the ARG.