Wolfenstein 3D is widely known as the very first First Person Shooter that changed gaming forever. One of the most popular shareware games ever for 3 straight years in a row, Wolfenstein 3D puts you in the pants of BJ Blackowicz, an american prisoner of war in a Nazi dungeon where you fight off guards, SS, dogs, zombies, and more assorted nazis! It is a gem every FPS player should have in their games collection!
Space Quest Mod to Wolfenstein 3D. You must to kill robots and sariens. There's an editor, you can create your own levels. Launch via RUN.bat.