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Castle Wolfenstein was a hit stealth-based action adventure shooter game released in September 1981. It was set in World War II, and the goal of the game is to infiltrate Castle Wolfenstein, find and steal Nazi war plans, and escape alive. One of the main distinguishing features of the game from those of its time was there was voice acting for the enemies, such as yelling "halt!" at the player.
Having sold 20,000 copies within the first year of release, Castle Wolfenstein became a huge hit, leaving a long legacy. Of the many sequels, Wolfenstein 3D helped popularize the First Person Shooter genre. There have even been recent sequels, the last one being Wolfenstein: The New Order, released in 2014.