Periscope is a shooting game, simulating a submarine attacking warships. It has a backdrop representing the ocean, upon which cardboard cutouts of ships hanging from chains are moved horizontally. Players look through a periscope to direct and fire torpedoes, which are represented by lines of colored lights and by electronic sound effects.
Sega's 1968 single-player redesign of Periscope popularized the quarter (US$0.25) cost per play of arcade games in the United States.
In a 1977 interview, Masaya Nakamura of Nakamura Manufacturing Co. (to become Namco in 1977) claimed that Periscope is the first amusement device that he built. Namco states that its Japanese release of the game was in 1965. Initially named Torpedo Launcher, the game is called Periscope in the April 1967 issue of Cashbox, where Nakamura offers direct import assistance to distributors. It has been speculated that the original Nakamura version may have been a custom model for department store rooftops, one year prior to the mass-produced model.