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).
Castle of Riddles
Castle of Riddles is a text adventure released by Acornsoft for the BBC Micro (in 1982) and Acorn Electron (1984) home computers. The game was written by Peter Killworth and was one of a series of text adventures written for, or ported to the BBC Micro by the same author (others including "Countdown to Doom" and "Philosopher's Quest"). As with all such games, only text is used. The player must use a simple 'verb-noun' format (e.g. 'Go North', 'Get lamp') to control the game. Unlike Killworth's other Acornsoft adventures, "Castle of Riddles" was not updated and reissued by Topologika so became unavailable after 1985 when Acorn Computers (parent company of Acornsoft) pulled out of the games publishing market. Some of the puzzles however were included in the Topologika version of "Philosopher's Quest".