Revisited Map Pack

The Revisited Map Pack for Halo 3, announced in April 2012, was created by Bungie as what is described as "a lookback at the Halo game series before we depart from it". It contained a map from Halo 1, 2, Wars and Reach.

ARG
Bungie held an alternate reality game. On the site, an e-mail message from Commander Keyes appeared. E-mailing the would result in a transmission from Blood Gulch, recorded by Matt Hullum in the role of Sarge from Red vs Blue. He states that you are the new recruit and a Pelican would be heading to your location to pick you up.

Visoconstriction
Visoconstriction is based off Blood Gulch. It was the first map to be revealed in the ARG, Sarge's message starting with "Blood Gulch Outpost-1 to Bungie headquarters".

The message ended with a username and password (the password being "password".) Logging into this account on bungie.net would bring you to an account which can't comment on anything. It had one message in it's inbox from Noble-Two, Kat.

Tip of the Spear
Tip of the Spear (Map) was based off of the Spire from Halo Reach and named after the singleplayer level it appears in. The e-mail from Kat stated that this had been destroyed.