The Sonic game which started it all is now optimized for mobile devices!
Race at lightning speeds across seven classic zones as Sonic the Hedgehog. Run and spin through loop-de-loops as you collect rings and defeat enemies on your mission to save the world from the evil Dr. Eggman.
This re-mastered mobile version of the SEGA Genesis classic features the full “Sonic The Hedgehog” game, plus these EXCLUSIVE features: 
NEW PLAYABLE CHARACTERS
Play as Sonic’s friends Tails & Knuckles for the first time.  Use their unique abilities to fly, climb, and glide around levels offering exciting new ways to explore.
OPTIMIZED FOR MOBILE
Sonic The Hedgehog now plays in widescreen at a smooth 60FPS offering unrivalled performance and the game’s legendary soundtrack has been fully re-mastered.
CHALLENGE YOUR FRIENDS
Challenge your friends in the new Time Attack Mode and check out how you rank with Leaderboards and Achievements.
Note: It's a new game! Your saved game files from previous versions will be incompatible with version 2.0.