1)  Get your copy of WOLF3D (versions BEFORE 1.4 required)
2)  Place the zip file into the WOLF3D directory.
3)  Unzip the zip file replacing all files.
4)  Type NEWMAPS to get new levels.
5)  Type OLDMAPS to get old levels.
6)  Play on Death Incarnate.
7)  Remember:  It's only a game!!!