Beyond Wolfenstein is a mod for registered Wolfenstein, made by Nate Smith. It was released on June 16, 1999.
Some coding changes are featured, along with new graphics. 10 levels are playable on Episode 1, with one level being playable in Episode 2.
Some of these levels were completely re-done for the following two versions.
Along with the two following volumes, this mod was withdrawn by request from Todd Hollenshead of id Software on February 3, 2001.
An SDL port, first in beta then a full version, was released in the second half of 2015 by Officer-Michael John.