Sonic the Hedgehog 2 (Aug 21, 1992 prototype) is a fascinating pre-release build of the classic Sega Genesis platformer. This early version offers a behind-the-scenes look at the game’s development, featuring unfinished levels, alternate layouts, and early mechanics that were later modified before the final release. It is a brilliant piece of gaming history for players wanting to see how Sonic and Tails’ iconic adventure evolved.
How to Play
Your objective is to race through the stages, collect rings, and defeat Dr. Robotnik. You can play this Sega Genesis prototype directly in your browser. Use the arrow keys to move Sonic, press Down while moving to roll, and press Z, X, or C to jump and perform a spin attack.
Tips
- Since this is a prototype build, some levels are incomplete and may contain glitches. Be prepared for unexpected physics or areas where you might get stuck!
- Use the Spin Dash (hold Down and press a jump button) to gain quick bursts of speed and climb steep hills.
Source: Hidden Palace

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