WOLF1A is a mapset for the 1.0 shareware version of Wolfenstein 3D, released in late 1992 by an unknown author. The set features ten new levels made from scratch and I can't even make any jokes because it's a really solid effort, especially for its time. Boo hoo. About a month later the mod was updated with a few map fixes and more extensive text document going into the details of the MAPTEMP.WL1 format change. The filename of this version also changed from WOLF1A to WOLF1B.