Wolfenstein
The "Wolfenstein" series of video games started with the 1981 stealth-adventure video game "Castle Wolfenstein". It was developed by American programmer Silas Warner, a pioneer in the early eras of video gaming, especially the stealth genre. It was published by his (then) company M.U.S.E. Inc. (Muse Software). The player controls an unnamed American prisoner of war as he steals war files containing information about secret German war plans while avoiding or sometimes killing guards, and tries to escape the fortified Nazi stronghold Castle Wolfenstein, set during World War II. The game is often credited as one of the first video games of the stealth genre, since it focuses more on avoiding or disarming enemies, and killing them is considered a last resort.
Castle Wolfenstein
Castle Wolfenstein is a stealth-based action-adventure shooter video game developed by Muse Software for the Apple II. It was released in 1981 and ported to MS-DOS, the Atari 8-bit family, and the Commodore 64. "Beyond Castle Wolfenstein" is its sequel.