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SegaDuet is a promotional device produced by Sega that allows two Game Gear handheld consoles to be connected together, enabling two players to play games connecting through a link cable. The device was available in 1998.

The SegaDuet retails in different parts of the world under various names, such as the SegaLink, Sega 1st Convertable and Play Goes On in Japan. SegaDuet uses the originally announced technological development, this capability was showcased and demonstrated in their first game, Sega Touges, but never commercially released.

The main feature of the device is allowing players to play local multiplayer-style games using exchangeable-port game gear. Add-on programs allow players control input and save game information via infrared coupling. The games which can be played through this method depend on original game hardware.