"Return to Castle Wolfenstein" is a first-person shooter video game released in 2001. It is set during World War II and follows the character B.J. Blazkowicz, an Allied soldier tasked with infiltrating a Nazi castle to thwart their supernatural experiments. The game combines historical elements with horror, featuring enemies like Nazis and undead creatures. The gameplay includes a mix of combat, stealth, and puzzle-solving. Players navigate through various levels, using a range of weapons and tools to defeat enemies and complete objectives. The game received critical acclaim for its engaging story, immersive atmosphere, and multiplayer mode, influencing future titles in the genre.