Hospitalstein 3D is a mod for shareware Wolfenstein, made by Steven L. Pappas. It was released on May 18, 2002.
The mod features only one new level, the boss level, which essentially is a massively watered-down version of Hans Grosse's original level. Otherwise, the original Episode 1 levels remain with minor tweaks.
Similar to Cuetips Revenge, the gameplay is crude and confusing and comical. The textures have all been replaced by a one-sided hospital wall, and guards are now nurses and patients.
No source code changes were featured, and it is thus playable in SDL.