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
Like its predecessor, "Beyond Castle Wolfenstein" is a combination action and adventure game with stealth elements. It is set in World War II during Adolf Hitler's rule as Chancellor of Germany. The objective of the game is to traverse all the levels of the secret Berlin bunker where the Führer is holding secret meetings with his senior staff. The player must retrieve a bomb that the operatives have placed inside the bunker and place it outside the door of the room where Hitler is holding his meeting, a scenario bearing a passing resemblance to the July 20 Plot.