Passage to Höllenteufel is a mod for registered Wolfenstein, made by Barry Christian. It was released on July 22, 2016.
Started in the summer of 2008 as Wolfenstein Forever, the mod was restarted several times before morphing into its current state.
It features 33 levels, with 1 of them being a secret level. Apparently only Phase 1, a Phase 2 is as of yet unfinished, and might possibly contain maps on the 128x128 grid.
Some graphics were changed as well, mainly in the vein of classic Wolfenstein. New coding features include rotten food (which causes the player to lose health), a new door type, seamless level flow, changed ceiling colors, four keys, ammo box and other classic changes.