Sunglasses

The Sunglasses are a pair of special sunglasses only for Knuckles the Echidna. This upgrade is found in Meteor Herd from Sonic Adventure 2. It is found in the middle of the stage, where Knuckles fights Rouge after the stage, but the area where it's found is covered and Knuckles has to find a switch to open it. With the Sunglasses, Knuckles can see invisible items like Item Boxes and Springs, similiar to Rouge's Treasure Scope. But he takes them off whenever he jumps. This upgrade is a requirement to finish the Hard Mode mission for Pumkin Hill.