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.
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.
