Ultimate Flash Sonic
Ultimate Flash Sonic - a fun, free Sonic X-style game online: One day while battling Eggman as usual, Sonic accidentally sets off a mysterious machine. The tremendous energy blast generated by that machine causes a rip in time and space, and Sonic, his buddies, as well as Eggman and his allies are all sucked into a warp in time and space...
After a while Sonic realizes that they are now on a planet where Earth-like humans live. Sonic meets a 12-year old boy named Christopher, who saves him from drowning in a Swimming Pool (Sonic can't swim).
Chris comes from a wealthy family, but turns out to be a shy and timid boy. However, while spending time with Sonic, he begins to long for the same speed, power and energy that he sees in Sonic.
In the meantime, Eggman and his robots have also reached the planet. Eggman immediately starts plotting new evil schemes. His first move is to search for the Chaos Emeralds, whose tremendous power reportedly help its owner to conquer the world.
So Sonic too ventures to find the Chaos Emeralds, and together with Chris and his friends try to defeat Eggman and his robotic creations. When starting a game - choose to play as one of the characters - Sonic, Tails, Knuckles or Amy. To control the character, use the left and right arrow keys to move normally. Press the space bar to jump. If you need extra speed then hold down the arrow button, press the space bar and then release the arrow down button. While in high speed - jumps will be more powerful too when you press the space bar.