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.
Beyond Castle Wolfenstein
Beyond Castle Wolfenstein is a 1984 World War II stealth game. A direct sequel to "Castle Wolfenstein", it is the second game in the "Wolfenstein" series, and the last installment to be released by original developer Muse Software before the name was revived for a first person shooter in 1991. "Castle Wolfenstein" was written solely by Silas Warner for the Apple II, while the sequel was was developed simultaneously for the Apple II and Commodore 64 by Warner, Eric Ace, and Frank Svoboda III. It was quickly ported to the Atari 8-bit family and MS-DOS.