Operation: Knightwolf is a mod for registered Wolfenstein, made by Paul Gibson. It was released on March 4, 2000.
The mod features 10 new levels and a handful of changed graphics, including new treasure, a ghost sprite, and a wall texture which featured ammo.
Initially released in March 2000 with 5 new levels, the mod was updated frequently until its final 10-level release on May 27, 2000.