Knuckles in Sonic 2

Introduction: Knuckles the Echidna in Sonic the Hedgehog 2 is the official lock-on combination produced by inserting Sonic the Hedgehog 2 into the Sonic & Knuckles cartridge. It allows Knuckles to play through most of Sonic 2 using his abilities from Sonic & Knuckles.

Gameplay & Mechanics: Knuckles can glide, climb walls, break certain barriers, and perform the Spin Dash. His lower jump height changes how several Sonic 2 stages must be approached, while climbing and gliding open routes that Sonic and Tails cannot normally use.

Key Features:

• Knuckles playable throughout the Sonic 2 campaign through Sega's Lock-On Technology.
• Gliding, wall climbing, barrier breaking, and Spin Dash abilities.
• Original Sonic 2 stages and Special Stages adapted to Knuckles' different movement characteristics.

This is not simply a fan character-swap hack; it is an official feature of the Sonic & Knuckles cartridge when locked onto Sonic 2.