Experience a unique and pivotal chapter in Sonic history with Sonic & Knuckles for the Sega Genesis. This innovative title allows you to play as Sonic the Hedgehog or Knuckles the Echidna, each with unique abilities and pathways through familiar yet altered zones from Sonic 3, plus new exclusive levels. Its revolutionary "lock-on technology" allowed players to physically connect Sonic 3 to the Sonic & Knuckles cartridge, creating the massive Sonic 3 & Knuckles experience, or connect Sonic 2 to play as Knuckles in that game. It’s a classic platformer with groundbreaking features.