Sonic & Knuckles Zip through 8 wild Zones, including Mushroom Hill, Sandopolis, Hidden Palace, and more Use the Lock-On feature for gameplay with Sonic the Hedgehog 2 or Sonic the Hedgehog 3 Zip through the 8 wild Zones, including Mushroom Hill, Sandopolis, Hidden Palace, and more Visit the 3D special stages hidden throughout the game Fend off the army of Robotnik's Badniks from Cluckoid, Toxomister, Sandworm, Spikebonker, and others Use the Lock-On feature for game play with Sonic the Hedgehog 2 or Sonic the Hedgehog 3