Doomsday is a map set for shareware Wolfenstein, made by Brian Larsen. It was released on October 31, 2002.
The map set may have been made even earlier. In the Read Me, dated April 2002, it was listed as being a newly renovated set. Some tweaks were made to levels by Bernt Hansen, who also submitted the mod and wrote the Read Me.
It features 10 new levels and is port-friendly as it only contains map files.