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Sonic the Hedgehog is a platform game developed by Sonic Team and published by Sega for the Mega Drive/Genesis system. It is the inaugural game in Sega's flagship Sonic the Hedgehog video game series, and was the first title developed by Sonic Team. It was first released on June 23, 1991 in North America, and the next day in Europe. The Japanese Mega Drive version was released on July 26, 1991.

This game propelled the Genesis into mass popularity in North America. After it was released, it eventually replaced Altered Beast as the game bundled with the console, and was later replaced with its first sequel, Sonic the Hedgehog 2. The game featured many novel elements which contributed to its popularity and helped to promote the uptake of 16 bit consoles.

Sonic the Hedgehog added the element of speed to the standard platform formula and introduced other unique elements as well, such as the loops, springboards, high-speed devices, and the rings now permanently associated with the game series.

--Overview
In the game, Sonic has to prevent Doctor Robotnik from collecting six of the Chaos Emeralds in an attempt to rule South Island. He must traverse six "zones", each comprised of three stages or "acts", until he confronts Robotnik for the last time in the Final Zone.

The gameplay centers around elements that exploit the increased performance of the 16-bit console over its 8-bit forebears. It is notable for being both simplistic and engaging for players.

At the time of its release, Sonic the Hedgehog was one of the fastest platformers that had yet been released. Sonic could run, jump and roll at significantly higher speeds than most platformers of the time. Unlike other platformers, the game's levels were designed to encourage the player to progress quickly. Springs, slopes, high falls and loop-de-loops were all available to both boost and challenge the player to reach high speeds. This was all accomplished without any slowdown in framerates, adding to the experience.
--Movement
Sonic's method of attack was also novel. As a hedgehog, he can curl up into a ball by either jumping or by rolling along the ground, a state in which he can damage most enemies by simply colliding with them. This was a change from most other platform games, where the player could damage enemies only by shooting or jumping on top of them. While rolling along the ground, Sonic can roll down slopes, gaining speed as he goes. Most slopes are irregular, as opposed to the fixed angles seen in previous platform games, and the game has the physics to match. Sonic's acceleration down a slope depends on its steepness; if travelling fast enough, he can run up and around 360° loops; and he suffers from drag underwater.