Breakthrough, also known as Wolfenstein 3D: Breakthrough is a scenario for the Mac version of Wolfenstein 3D created by yyr. It has 32 levels and is one of his first big map-sets.
32 levels, broken up into eight "zones." Lots and lots of action, tough level layouts and of course Nazis. Includes enhanced version (for Second Encounter or better) and lots of additional levels. Last updated October 2016.
Download Breakthrough at yyr’s Page of Wolfenstein Insanity