Sonic & Knuckles
Sonic symbol
North American boxart
Developer(s) Sonic Team
Publisher(s) SEGA
Distributor(s) SEGA
Designer(s) Hirokazu Yasuhara
Series Sonic
Engine Sonic 1 Engine Modified
Released Genesis/Mega Drive
NA/JP October 18, 1994
EU/AUS November 1994
NA 1996
EU January 1, 1996
Wii Virtual Console
JP October 27, 2009
PAL February 12, 2010
Xbox Live Arcade
JP/NA June 10, 2009
Genre(s) Platform, Adventure
Mode(s) Single player, multiplayer
Ratings VRC: GA Pan European
Platform(s) Mega Drive/Genesis, PC, Mac OS X, Virtual Console, Xbox Live Arcade
Media 8-Megabit cartridge
Input methods Game controller

Sonic & Knuckles (ソニック&ナックルズ, Sonikku & Nakkuruzu) is a 1994 platform video game in Sonic the Hedgehog series for the Sega Mega Drive/Genesis. It was developed in the United States at SEGA Technical Institute by members of Sonic Team, and was published by SEGA worldwide on October 18, 1994.

As well as working as a standalone game, through a system dubbed "lock-on technology," Sonic & Knuckles acts as an expansion pack to both Sonic the Hedgehog 2 and Sonic the Hedgehog 3, the latter with which it was developed in tandem.

In the Super Smash Flash series

Knuckles the Echidna becomes playable in Super Smash Flash. The stage Sky Sanctuary Zone is based on the zone of the same from this game.

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