Hexen II is a dark fantasy first-person shooter with RPG and action elements. Both full videogame as well as this demo have been developed by Raven Software Corporation, published by id Software, and distributed by Activision in 1997. Hexen II is based on an enhanced version of the Quake graphics engine, and so it uses OpenGL graphics library for 3D acceleration. Full compatibility and optimal performance with 3dfx video cards have been obtained with an embedded library named opengl32.dll. This one is a an OpenGL ICD (Installable Client Driver) that works as a wrapper and allows to use Glide capabilities of the 3dfx hardware.