Alexstein is a mod for registered Wolfenstein, made by Alex Arzola.
New levels are featured on the first three episodes, and a number of graphics have been changed.
Initially released on May 28, 1999 as a map set with new graphics, it was re-released in September that year with a new EXE featuring changed health and ammo and new episode names. This EXE has a number of glitches that renders it hard to play on newer machines.