Sonic & Knuckles - Part 1 (Sonic's Start)
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Sonic & Knuckles (Japanese: ソニック&ナックルズ Hepburn: Sonikku to Nakkuruzu) is a platform video game developed by Sonic Team and published by Sega for the Sega Genesis. Released on October 18, 1994, it is the fourth installment in the main Sonic the Hedgehog series and a direct sequel to Sonic the Hedgehog 3. It follows Sonic the Hedgehog and Knuckles the Echidna in their respective quests to save Angel Island; Sonic tries to prevent Dr. Robotnik from relaunching his orbital weapon, the Death Egg, while Knuckles scuffles with Robotnik's minion, EggRobo.
Sonic 3 and Sonic & Knuckles were originally intended to be a single game. However, due to time constraints and the cost of a large-memory-capacity cartridge, Sega split the game in two. The Sonic & Knuckles cartridge uses "lock-on technology" that allows the game to connect to Sonic the Hedgehog 2 and Sonic the Hedgehog 3, so that elements of both Sonic & Knuckles and the locked-on game are combined.
Critics were impressed with the lock-on technology and hailed Sonic & Knuckles as "an exceptional game" despite its similarity to its predecessor. It has since been re-released in various compilations and on online platforms such as Xbox Live Arcade, the Wii Virtual Console and Steam.