What is Sonic Colors about

After apparently developing a sense of remorse for his past indiscretions, Dr. Eggman opens "Dr. Eggman's Interstellar Amusement Park" up in space, made up of several planet sized attractions. Suspicious, Sonic, accompanied by Tails, goes to check it out and comes across Yacker, who comes from a species of aliens known as Wisps. After managing to communicate with him, they learn that the other Wisps have been kidnapped by Dr. Eggman, who plans to harness their "Hyper-Go-on" life energy for his nefarious schemes. Allying himself with Wisps and using their special powers, Sonic goes to investigate, and soon learns that Dr. Eggman is transforming the Wisps into Nega-Wisps as fuel for a mind control beam. He visits each planet, liberating the Wisps and shutting down the generators linking them to the amusement park. When Dr. Eggman tries to fire the mind control cannon onto Sonic's home world, a piece of wreckage from an earlier boss fight causes it to malfunction. As the place prepares to explode, Sonic sends Tails back down the space elevator whilst he faces off against Dr. Eggman as he uses the Nega-Wisps for his final contraption. With the help of the Wisps, Sonic manages to defeat Dr. Eggman and return safely to dry land. In the DS version, they learn that the Mother Wisp had been infected by the negative energy, so Sonic becomes Super Sonic in order to defeat and purify her.