An unofficial sequel to Wolfenstein 3D that was released by Formgen as a retail only game (not shareware like Wolf3D) this demo version unfortunately contains only two playable levels. However the Spear of Destiny game is still great fun, although it uses the exact same engine, graphics, sounds etc as Wolfenstein 3D and features only new levels. The full version is still available on id Software's website, or via other means such as eBay.