Ultimate Flash Sonic is a flash action game that is the updated version of the Sonic the Hedgehog in Flash platform. The game is very addicting and contains a variety of unique elements and characters derived from the original Sonic for Sega.

The gameplay involves 4 playable characters which you are required to control using the arrow keys, space to jump and down and space to turbo power-up of the character. There are also 2 more secret characters in which players are required to unlock by successfully completing the levels.