Halo 3 Epsilon

Halo 3 Epsilon is believed to be a Halo 3 build.

It was released to Microsoft employees as of August 10, 2007, and featured Forge and multiplayer modes. While it has not been officially confirmed in a news release from Microsoft or Bungie Studios, several people have been seen playing it, including Bungie content manager Frankie O'Connor, Xbox.com representative "Major Nelson", and a handful of Microsoft employees.