Facts About...

Sonic is known best for his speed, with the ability to run at speeds higher than Mach 1[1], at a staggering 760 mph. He is known as "the fastest thing alive," and can run backwards at full speed just as well as forwards, as shown in the Team Sonic opening cutscene of Sonic Heroes, in an episode of Adventures of Sonic the Hedgehog and Sonic Underground, and near the end of the first episode in Sonic X. Due to such speed, he is able to scale right up the walls of buildings, or similar structures, and can also run right over the water.
It is unknown how much faster Sonic can run beyond Mach 1, although it is variously assumed he can. In Sonic Battle it is shown that he can move several times the speed of sound. In Emerl's story, Sonic takes on and defeats him in under 30 seconds (the Final Egg Blaster fires in 30 seconds). During this time he and Emerl shown doing several attacks as if time itself is drastically slowed down (even slow enough to have ten rounds). It is also believed that Sonic can move faster while in spinball form then running, possibly even reaching the Speed of Light due to the various proofs, such as in Sonic Adventure 1/2 and Sonic Heroes where he could use the move Light Speed Attack which, stated by Tikal, attacks enemies at Light Speed. In the Sonic X Anime, he is shown to match speeds with a lightning bolt, in the episode "Zelkova Strikes Back".
As shown in Sonic Battle, Sonic posseses the ability to heal him self at supersonic speeds by presumingly vibrating his molecules.

Sonic, Many of his abilities are variations on the tendency for hedgehogs to roll into tight balls for protection. Since his introduction in the first Sonic the Hedgehog, Sonic's primary offensive maneuver is the basic Spin Attack (or "Sonic Spin Attack"). As Sonic jumps or runs, he curls up and spins into a spiky ball when in motion that can damage, destroy or burrow through many obstacles or foes. Later games in the series expanded on this basic attack. Two of these enhancements are now basic moves

The Spin Dash was introduced in Sonic 2 and involves Sonic spinning on the spot before blasting off at full speed, and the Homing Attack, officially introduced in Sonic Adventure, although unnamed variations of it appeared in Sonic 3 & Knuckles and Sonic 3d Blast, in which Sonic dashes in midair toward a target. Sonic curls into a ball and revs up before charging forwards in a burst of speed