a 1991 platform game developed by Sega for the Sega Genesis (Mega Drive). Sonic the Hedgehog must traverse South Island, rescuing his animal friends and collect the powerful Chaos Emeralds to ultimately defeat Dr Robotnik. This tag should be used for questions about the first Sonic game, for ...

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Can you get all Chaos Emeralds without completing every level?

Can you do this, perhaps via the level select code? Or must you complete the whole game again?
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What are the different versions of Sonic the Hedgehog (1991) and what differs between them?

So, it is my understanding that while most of the ports of Sonic the Hedgehog 1991 are straight ports, there are a few officially-released versions of the game out there with gameplay differences. ...
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How do I fix the sound issues in the Sonic series iOS games?

Been having this issue for a bit. Basically the sound stops playing in Sonic 1, Sonic 2 and Sonic 4 episode one. The first time it happened I just redownloaded the games and then it was fine but now ...
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How could some classic Sonic zones be both wrap-around and partially underwater?

In Sonic The Hedgehog, some levels wrapped around from top to bottom. Some levels also have water in them. What confuses me is that a few levels have both. The bottom wraps around to the top, so the ...
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Is there any bonus for collecting all the rings on a level?

Can all the rings be collected before the end of the level? Does anything special happen if you collect them all? How many rings are on the first level?