Wolfenstein 3D Second Edition (also known as Wolf3D 2E) is a mod for registered Wolfenstein. It was made by Spenser Whaley, and was originally released on his own site in July 2003. Six years later, it was posted on the Dome.
It features 11 levels (10 new levels on episode 1 and 1 new level on Episode 2) of generally good quality and numerous source code changes. Changed graphics appear, mainly courtesy of 1999's MegaDemo.
Sadly, a bug that affects saved games was never fixed.