This ancient hypership, constructed by the mysterious Architects, is on its way to unknown layers of reality. No one's really sure why exactly humans are fighting over it.
The Hypership (gg_hyperspace) is a CSS port of an old TF2 deathmatch map of mine, Against All Odds, which was in turn inspired by DM-Pyramid from Unreal Tournament. The map started out as a test map for a hyperspace texture I'd made but I decided to turn it into a full Gun Game map.
It supports 32-player play and features a gravity lift in the center that leads to high ground (although the support beams on the sides of the pyramid can also be climbed).
Download page at GameBanana.