Beyond Castle Wolfenstein is a 1984 World War II stealth game. A direct sequel to Castle Wolfenstein, it is the second game in the Wolfenstein series, and the last installment to be released by original developer Muse Software before the name was revived for a first-person shooter in 1991. Castle Wolfenstein was written solely by Silas Warner for the Apple II, while the sequel was developed simultaneously for the Apple II and Commodore 64 by Warner, Eric Ace, and Frank Svoboda III. It was quickly ported to the Atari 8-bit computers and MS-DOS.

A stealth game is a type of video game in which the player primarily uses stealth to avoid or overcome opponents. Games in the genre typically allow the player to remain undetected by hiding, sneaking, or using disguises. Some games allow the player to choose between a stealthy approach or directly attacking antagonists, but rewarding the player for greater use of stealth. The genre has employed espionage, counter-terrorism, and rogue themes, with protagonists that are special forces operatives, special agents, secret agents, thieves, ninjas, or assassins. Some games have also combined stealth elements with other genres, such as first-person shooters and also platformers.