1991
   A fully-developed Sonic makes his much-anticipated descent upon the world. Although his success in his home country of Japan was only moderate, Sonic's broad appeal proved a massive hit in all other markets, the US especially.

June 23 -- Sonic the Hedgehog on the Sega Genesis is released in the USA.
June
 -- Sonic the Hedgehog on the Sega Mega Drive is released in Europe.
July 26
 -- Sonic the Hedgehog on the Sega Mega Drive is released in Japan.
October 25
 -- Sonic the Hedgehog on the Sega Master System is released in Latin America.
December 28
 -- Sonic the Hedgehog on the Sega Game Gear is released in Japan.
December
 -- Sonic the Hedgehog on the Sega Game Gear is released in the USA and Europe.

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