A list of 13 maps was found in the Halo 3 beta code. The list is as follows.
- Chill – Halo 3 Chill
- Construct – Halo 3 Construct
- Cyberdyne – Halo 3 Cyberdyne
- High Ground – A relic of older conflicts, this base was reactivated after the New Mombasa Slipspace Event
- Guardian – Halo 3 Guardian
- Isolation – Halo 3 Isolation
- Valhalla – The crew of V-398 barely survived their unplanned landing in this curious gorge
- Epitaph – Some believe the Forerunners preferred desolate places. Others suggest that few other sites survived the Flood
- Shrine – Halo 3 Shrine
- Snowbound – Hostile conditions did not prevent the Covenant from seeking salvage on this buried Forerunner construct
- Warthog Inc – Halo 3 Warthog Inc
- Last Resort – Remote industrial sites like this one are routinely requisitioned and razed as part of Spartan training exercises