Map Set 4 is a map set for shareware Wolfenstein, made by Colonel Bill. Originally available on his website, it was made available on the Dome at a later date.
10 new levels are featured. Some features interesting design, including the secret level which is split down the middle of the 64x64 slate in two different environments.
Level 4 features a creative approach to marching guards.
A map set, it is playable in SDL.
Download Map Set 4 at Colonel Bill's Wolfenstein 3D Page