How to Get Two Player to Work on "Sonic Colors"by Matthew TomUpdated September 22, 2017
Sonic the Hedgehog once again fights nemesis Dr. Eggman in "Sonic Colors," this time in an interstellar-theme amusement park. This Wii game features a two-player mode so you and a friend can enter Dr. Eggman's Sonic Simulator, where 21 levels divided into seven zones with three acts each. In the final act in each zone, there is a Chaos Emerald to collect. If you collect them all, thus finishing all 21 levels, you unlock Super Sonic.
Insert the "Sonic Colors" disc into the Wii. Start the game.
Open the World Map.
Click on the Game Land icon, which looks like Sonic the Hedgehog's head, to access Eggman's Sonic Simulator.
Choose "2 player" on the Sonic Simulator start-up screen.
You need to collect 180 red rings to unlock the second and third acts for Sonic Simulator.