Wolfenstein 3D Gerolf's SS: Castle Lost v. demo

Description
After blazing through Castle Fefehlbuchstabiersburg, killing Heinrich Himmler and his most trusted SS personnel, you receive word from the underground that there is yet another castle, the castle with no name. The SS dubs it as, "Castle Verloren", "Castle Lost". Himmler had a strange obsession with this mysterious castle, and was just returning from it the very day you killed him. The castle is very huge, but only 2 portions of the castle are being used for SS activities. To make sure the SS never rise again, you grasp your handgun, and sneak into a near window, a guard is standing just inches from you, what ever will you do?
Instructions
This is a standalone game. It does not require Wolfenstein 3D.