WinWolf3D is a Microsoft Windows source port for Wolfenstein 3D and Spear of Destiny, Catacomb 3D, Catacomb Abyss and Blake Stone. WinWolf3D was developed by Adam Biser. It is written in Visual Basic 6 and features a basic scripting language called WGD ('WinWolf3D Game Definition') to define various aspects of the games. Development started in 2002 and was discontinued in 2008. Support for Catacomb 3D and Catacomb Abyss is incomplete: levels are playable, but functionality such as the Crystal Sphere or the Crystal Hourglass objects do not work.