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However, in Sonic & Knuckles, unlike in Sonic 3, the player chooses either Sonic or Knuckles at the title screen, Miles "Tails" Prower is not available to select, and the player cannot control two characters together. Since Sonic & Knuckles and Sonic the Hedgehog 3 were initially developed as one game, their gameplay is similar: both are 2D side-scrolling platformers with similar level design, graphics, and game mechanics. Knuckles explores Mushroom Hill, the first zone of Sonic & Knuckles

It has also been re-released through various compilations and on digital platforms such as Xbox Live Arcade and the Wii's Virtual Console, while it was bundled with Sonic 3 on Steam. Alongside Sonic 3, a Windows port was released through the Sonic & Knuckles Collection (1997). Sonic & Knuckles received positive reviews critics were impressed with the replay value and lock-on technology, despite its similarity to Sonic 3. Sonic 3 & Knuckles sold a combined four million copies worldwide, making them some of the best-selling Sega Genesis games. Sonic & Knuckles was released for the Sega Genesis on October 18, 1994. Sonic the Hedgehog 2 (1992) can also be attached, allowing players to control Knuckles in Sonic 2 stages. The Sonic & Knuckles cartridge features an adapter that allows players to connect the Sonic the Hedgehog 3 cartridge, creating a combined game, Sonic 3 & Knuckles. Sega Technical Institute developed Sonic & Knuckles simultaneously alongside Sonic 3 they were planned as a single game until time constraints and cartridge costs forced the developers to split it.
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Like previous Sonic games, players traverse side-scrolling levels at high speeds while collecting rings and defeating enemies. The sequel to Sonic the Hedgehog 3 (1994), players control Sonic the Hedgehog and Knuckles the Echidna in their quests to save Angel Island Sonic tries to prevent Doctor Robotnik from relaunching his orbital weapon, the Death Egg, while Knuckles scuffles with Robotnik's minion, EggRobo. Sonic & Knuckles is a 1994 platform video game developed and published by Sega.
