Wolfenstein
Silas Warner, an American programmer and an employee of software company Muse Software, was a pioneer of early video game development, especially the stealth genre. He had access to computers in college, and when he worked for the IBM Mainframe architectures before joining Muse Software. The computer he used for game-development, P.L.A.T.O., was one of the firsts with multiple functioning terminals and an example of early computer networks. Warner developed, with P.L.A.T.O., a series of classic video games like his flight simulator and arcade shooter. Inspired by the arcade shooter video game "Berzerk" and the 1961 war film "Guns of Navarone", he developed "Castle Wolfenstein", a stealth-adventure video game in which the player controls an unnamed American prisoner of war as he steals German files containing secret war plans, while avoiding, disarming or at times killing hostile guards and trying to escape the fortified Nazi stronghold 'Castle Wolfenstein', set in World War II. The game was published in 1981 by Warner's company M.U.S.E. Inc. (Muse Software).
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.