A stealth game is a type of video game that tasks the player with using stealth to avoid or overcome antagonists. Games in the genre typically allow the player to remain undetected by hiding, using disguises or avoiding noise. Some games allow the player to choose between a stealthy approach or directly attacking antagonists, perhaps rewarding the player for greater levels of stealth. The genre has employed espionage, counter-terrorism and rogue themes, with protagonists who have been identified as special forces operatives, spies, thieves, ninjas, and assassins. Some games have also combined stealth elements with other genres, such as first-person shooters and even platformers.
Some of the early games emphasizing stealth include Manbiki Shounen (1979), Lupin III (1980), 005 (1981), Castle Wolfenstein (1981), Infiltrator (1986), Metal Gear (1987), and Metal Gear 2: Solid Snake (1990). The genre became popular in 1998, with the mainstream success of Metal Gear Solid as well as Tenchu: Stealth Assassins and Thief: The Dark Project. Tenchu was the first 3D game in the genre, while Metal Gear Solid, released some months later, transformed the relatively obscure Metal Gear series into a highly acclaimed, profitable franchise with numerous sequels, while Thief pioneered 3D stealth games on the PC. These games were followed by other stealth series, such as Hitman and Splinter Cell. Later games in the genre have allowed the player to choose between, or combine, stealth tactics and direct confrontation.