Wolfbel 1 is a map set for registered Wolfenstein. It was made by Brian Lowe and was originally released on February 8, 1998.
It features 37 genuinely new levels with the remaining 23 levels being based on original Wolfenstein levels.
Being a map set, it is playable in SDL.
This was also converted to ECWolf as part of the WOLFBEL Collection by AstroCreep
Download WOLFBEL Collection for ECWolf at Wolfsource