A free program for Android, by SEGA.

Sonic the Hedgehog™ is a classic arcade game that is optimized for mobile devices. It is the game that started the whole Sonic the Hedgehog series. Now you can play it on your Android phone or tablet.

The game is about a robot named Sonic who is searching for the key to save the world. He finds it in the form of a tiny red disk that can be found in various zones. In each zone, he must go through a series of obstacles that will test his speed and skills. The more he goes, the more the world is unlocked. He will also find his friends along the way. They will help him to get to the final zone where he will find his final challenge.

This is the game that will let you play as Sonic the Hedgehog. You can go through a variety of zones with different challenges. Each of them will test your speed and skills. You will also be able to unlock other characters and use their unique abilities to help you.