Repost from DHW forum:
Here's a little something me and Linuxwolf have worked on: https://dl.dropboxusercontent.com/u/7510301/Wolfenstein%203D%20Lite%20Beta.zip
It's still a beta, but the gist is this: You have no weapons. You can use the shadows to hide from the enemies. The default is that you walk slowly, which means the guards won't hear you. You can still walk faster, using SHIFT, but this increases the chance that guards will hear you.