Hallowein 3D is a mod for shareware Wolfenstein, made by Colonel Bill. It was released on Halloween 1997.
The mod features 10 new levels of good quality and a host of Halloween-themed sprites and sounds, making for an eerie and atmospheric gameplay.
Sprites are now bats, ghosts, pumpkins and even the character Lurch from The Adams Family is featured as a block object. The protagonist is a Jack O'Lantern.
An SDL port was released on October 30, 2010 opening for a slight reassessment of the mod, now viewed as a particularly inventive mod of its time.