Monkeystein is a mod for registered Wolfenstein, made by Ian Summerfield. It was released on July 18, 2003.
It features 31 levels, plays in episodic flow and guarantees the player an ape-tastic adventure. Many graphics have been changed, and features new guards guaranteed to drive the player bananas.
Some sprites have been lifted from DOOM and Spear Resurrection. A revised version was released on July 22, 2003 fixing mapping bugs.
The EXE used is that of Mallenstein; this is most likely because Summerfield did not own the actual Wolfenstein 3D EXE.
Download Monkeystein at The Wolfenstein 3D Vault