Sega Genesis game - SONIC & KNUCKLES - expansion cart, tested

For Sale:  Fully tested and oh so very fun!

Sonic & Knuckles is a 1994 platform game developed and published by Sega. It is part of the Sonic the Hedgehogseries and the sequel to Sonic the Hedgehog 3 (1994). The story follows the player characters, 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. The game takes place across six levels in which the player collects rings and fights bosses.

The Japanese members of Sega Technical Institute developed Sonic & Knuckles simultaneously alongside Sonic 3. The two were intended to be released as a single game, but time constraints and small cartridge sizes forced Sega split the project in two. The Sonic & Knuckles cartridge features "lock-on technology" that allows the game to connect to the Sonic the Hedgehog 2 or Sonic the Hedgehog 3 cartridges, combining elements from either game. This feature was implemented so the game could be experienced as intended.

Sonic & Knuckles was released for the Sega Genesis on October 18, 1994. It sold 1.24 million copies and received positive reviews; critics were impressed with the replay value and lock-on technology despite its similarity to Sonic 3. It has been rereleased 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 as intended on Steam.

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