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).
Return to Castle Wolfenstein
In the United States, "Return to Castle Wolfenstein" sold 350,000 copies and earned $17 million by August 2006. It was the country's 48th best-selling computer game between January 2000 and August 2006. Combined sales of all "Wolfenstein" computer games released between January 2000 and August 2006 had reached 660,000 units in the United States by the latter date. "Return to Castle Wolfenstein" received a "Silver" sales award from the Entertainment and Leisure Software Publishers Association (ELSPA), indicating sales of at least 100,000 copies in the United Kingdom. By January 2002, Activision reported that shipments of "Return to Castle Wolfenstein" to retailers had surpassed one million units.