Castle Wolfenstein

Castle Wolfenstein is a 1981 action-adventure game developed by Silas Warner for the Apple II and published by Muse Software in 1981. It is one of the earliest games based on stealth mechanics. A port to Atari 8-bit computers was released in 1982, followed by Commodore 64 (1983) and MS-DOS (1984). The player takes the role of an Allied prisoner of war during World War II who is held captive in the fictional Castle Wolfenstein. After escaping from a cell, the player's objective is to find the Nazis' secret war plans and escape from the castle. Nazi soldiers can be dealt with via impersonation, sneaking, or killing.