A faithful port of Macintosh Wolfenstein 3D to PC using the Wolf4SDL base, this mod brings you some vintage Mac gameplay and prepares the ground for future Mac mod ports.
There's a huge skull in there, but you can only really see it in the editor.
Now for The Skull, five maps for the First Encounter. Not a huge deal, just some fairly decent levels that slowly grow in size before peaking at a floor where the titular skull is featured, complete with a horde of enemies and bosses. There is no storyline and no documentation that I know of.