"Castle Wolfenstein" is a classic video game released in 1981, developed by Muse Software. It is a stealth-based action-adventure game set during World War II, where players assume the role of an Allied soldier infiltrating a Nazi stronghold. The objective is to gather intelligence and escape without being detected. The game is notable for its early use of 3D graphics and top-down perspective. Players navigate through various rooms, encountering enemies and collecting items. Its success led to sequels and inspired the development of the Wolfenstein series, which has become a significant franchise in the gaming industry.