Released in 1981 by Muse Software.
Designed and Written by Silas A. Warner.
This game is an absolute classic.
Castle Wolfenstein is just a little harder to play now because you can NOT cheat by flipping the disk drive door open when caught or killed. This trick prevented writing back to the floppy disk and then you could start again right where you left off. Now you might actually have to become a good player.