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).
Splash Damage
Following Market Garden's success, Activision and id Software asked Splash Damage to produce three additional multiplayer maps for the "Return to Castle Wolfenstein Game of the Year Edition". The same year, Splash Damage partnered with the two companies to develop "", a stand-alone expansion based on "Return to Castle Wolfenstein". The Windows version of "Wolfenstein: Enemy Territory" was released online for free on 29 May 2003, with Linux and Mac versions following later. "Wolfenstein: Enemy Territory" won several Game of the Year and Editor's Choice awards and remains one of the most popular online first-person shooter titles.