Sonic Colors/Red Star Rings

In Sonic Colors, Red Star Rings are known as oppositional collection items. The maximum number of Red Star Rings that Sonic can Collect is one hundred and eighty, and he can collect five within each Act. Collecting ten Red Star Rings unlocks an act in the Eggman's Sonic Simulator (Game Land), accessible on the top right of of the world select screen by selecting Metal Sonic's head. Collecting all one hundred and eighty Red Star Rings unlocks all 18 acts in Game Land.

All 180 Red Star Rings can be found in the following locations:

Aquarium Park
Asteroid Coaster