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Sonic the Hedgehog is a 2D action platformer developed by Sonic Team and published by Sega for the Sega Genesis. The player controls Sonic, a fast blue hedgehog fighting Dr. Robotnik and rescuing animals transformed into mechanical enemies. Its stages combine running, jumping, loop-the-loops, springs, hazards, and collectible Rings with a strong emphasis on momentum. The game is organized into six themed zones, each ending with an act boss or special challenge. Released in 1991, it became a defining Genesis title and was widely praised for its responsive controls, energetic presentation, and speed-focused level design.