Ultimate Flash Sonic is a Flash action game, the updated version of Sonic the Hedgehog on the Flash platform. The game is addicting and contains various unique elements and characters derived from the original Sonic for Sega.
The gameplay involves four playable characters, which you must control using the arrow keys, space to jump and down, and space to turbo power-up of the character. There are also two more secret characters that players must unlock by completing the levels.