In 1991.Sonic and enemys were the only people.No tails till 1992.
Ah, remember 1991 it was the year sonic was "born". it was June 23 at 12:00am the first sonic game came out millions of kids bought, played, and finished this game most 12 year olds at the time said "look at that a blue fast hedgehog what will they think of next? he's way better than that fat plummer guy" NN96
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Tails first appeared in Sonic the Hedgehog 2.
The first ever Sonic game created (named simply 'Sonic The Hedgehog') was released for the Genesis in 1991.
No, there are only 6 Chaos Emeralds available in the first Sonic the Hedgehog. Super Sonic's first appearance is Sonic the Hedgehog 2 when SEGA brought in another Chaos Emerald.
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Sonic RPG episode 10 will come in mid of 2014.