ZW1 Phase 1 is a map set for registered Wolfenstein, made by De Zeurkous. It was released on June 27, 2004.
It features 10 new levels of good quality played on Episode 1.
A full 60 level map set was never realized, though a 1-level demo of Episode 2 was released on August 18, 2004. An unfinished bonus level was also included. This download also include the complete Episode 1.