There was an official retail add-on level pack released by Apogee for "ROTT" entitled "Extreme Rise of the Triad" also released in 1995. The add-on was produced by two key members from the original team, Tom Hall and Joe Siegler. Generally the maps produced in this add-on are considerably harder than the original game's maps due to tricks that Hall and Siegler had learned in the editor since the release of the original. It also includes some user made level editors, a random level generator from Apogee, maps, and sound files. The levels were released as freeware on September 1, 2000. The remaining materials on the "Extreme ROTT" CD were released as freeware online as part of a "ROTT Goodies Pack" on February 15, 2005.