Sonic the Hedgehog 3 & Knuckles allows the player to play Sonic 3 levels as Knuckles or Sonic & Knuckles levels as Tails, or both Sonic and Tails. Other new features are the ability to collect Super Emeralds, unlocking new "Hyper" forms for Sonic and Knuckles and a "Super" form for Tails; improved save options; access to areas that Sonic or Tails could not previously access; altered boss forms; and an additional ending that shows Sonic returning the Master Emerald to Angel Island.
Sonic the Hedgehog 3 & Knuckles allows the player to play Sonic 3 levels as Knuckles or Sonic & Knuckles levels as Tails or both Sonic and Tails Other new features are the ability to collect Super Emeralds unlocking new "Hyper" forms for Sonic and Knuckles and a "Super" form for Tails; improved save options; access to areas that Sonic or Tails could not previously access; altered boss forms; and an additional ending that shows Sonic returning the Master Emerald to Angel Island