Guardian (map)
From Halopedia, the Halo wiki
Template:Multiplayer Map Infobox
Guardian[1] is a map referenced in the Halo 3 Beta code. Very little information about it has been provided, and what little there is comes from a leaked issue of EGM magazine. Although some speculated it to be a remake of Prisoner, this was debunked when it was proved to be a "spiritual successor" to Lockout.
Instead of a desolate and snowy mountain, Guardian is set in what appears to be a complex surrounded by jungle. Little else is known about it, but some have described its appearance as similar to Sanctuary.
Guardian is bigger than the original Lockout.
References
Lockout was the most popular Halo 2 map, Guardian looks to be its successor.