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Sonic & Knuckles
Developer(s)	Sonic Team and Sega Technical Institute
Publisher(s)	Sega
Designer(s)	Takashi Thomas Yuda (character design), Hirokazu Yasuhara (lead designer), Yuji Naka (programming)
Release date(s)	Sega Genesis  October 17, 1994  October 18, 1994 Xbox Live Arcade  September 9, 2009
Genre(s)	Platform
System(s)	Sega Genesis, Sega Channel, Windows, GameTap, Xbox Live Arcade, Virtual Console
Players	1-2
Rating(s)	ESRB: Kids to Adults VRC: General Audiences
Preceded by	Sonic the Hedgehog 3
Followed by	Knuckles Chaotix
Series	Sonic the Hedgehog

For the lock-on minigame, see Blue Sphere.

Sonic & Knuckles is a platform game in the Sonic the Hedgehog series, developed by Sonic Team in collaboration with Sega Technical Institute, and published by Sega for the Sega Genesis in 1994. It is the direct sequel to Sonic the Hedgehog 3, which was released earlier that year. The game features unique "lock-on technology" which enables another cartridge to be plugged in via the socket on top. This allows for Knuckles to be used in Sonic the Hedgehog 2 and links the two direct sequels together into Sonic the Hedgehog 3 & Knuckles.

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