This version combines Sonic & Knuckles' lock-on technology with Sonic the Hedgehog 2, offering a unique gameplay experience. Players can enjoy the combined worlds and characters, with Knuckles' abilities adding a different dynamic to Sonic 2's levels. The game retains the core platforming and speed elements of the original Sonic titles, emphasizing fast-paced action and exploration. Sega developed this combined version, building upon the success of its individual titles to create a more expansive adventure for fans.

Sonic & Knuckles + Sonic the Hedgehog 2 (World)

Sonic & Knuckles - Reversed Frequencies