Combining the two games creates the definitive experience, allowing players to play through all 14 zones as Sonic, Tails, or Knuckles, with the ability to save progress.
The most distinctive feature of Sonic & Knuckles is its unique cartridge design. The top of the cartridge features a flip-open slot that allows players to "lock on" other games. Sonic & Knuckles
The game picks up immediately after Sonic 3 . Sonic (or Knuckles) continues the quest to stop Dr. Robotnik from relaunching the Death Egg. Sonic & Knuckles - Sega-16 Combining the two games creates the definitive experience,
Inserting almost any other Genesis cartridge (including the original Sonic 1 ) grants access to thousands of unique "Blue Sphere" special stages. Gameplay and Story The game picks up immediately after Sonic 3
Locking on Sonic 2 allows players to play through that entire game as Knuckles the Echidna , utilizing his unique abilities to find secrets unreachable by Sonic.