Eggman's Sonic Simulator

Sonic Simulator (widely known as Sonic Sim) is the multiplayer mode of Sonic Colors. It is only playable as a form of a co-op mode. The playable characters are a variety of differently colored Robo-Sonics.

Sonic Sim was revealed by IGN on 2 September, 2010. The mode is unlocked by collecting red emblems throughout the in-game stages. Unlocking them is optional and will be selected on the menu screen.

The co-op is mainly a 2D scroll co-op and the Robo-Sonics can activate Wisp Power as well. Most of the levels are very plain, with no specific look and a simple colored background. The levels are of a long length. Abd there are 21 stages in total

Trivia

 * Sonic Sim was first leaked by Amazon's Japanese website showing a picture of Robo-Sonics running in a colorless world. But it was then removed the other day.
 * It wasn't SEGA who first confirmed Sonic Sim but it was IGN's Sonic Colors' preview. However they hadn't named it "Sonic Simulator".