The Treasure Scope is a G.U.N.-made scouting device that Rouge wears on the right side of her head. It has a magenta piece with writing on it, and a green lens that attaches to the upper right side of Rouge's face. The lens can be put over Rouge's right eye. When obtained, it allows Rouge to see and interact with invisible items, such as item boxes, Rings and Springs. It can be used by selecting it in the action window and the pressing the B button, but will be taken them off whenever Rouge jumps. They are the equivalent to Knuckles the Echidna's Sunglasses.
When beginning the stage, the player should head to the C-Block of the area (on the right) and climb up to the second floor, the "Yellow" floor that is attached to the wall. On this floor the player will find an Ancient Ruin where they must play the Mystic Melody. This will make several platforms appear which lead over to the opposite wall, where the player will find some iron containers blocking a gap into the wall. They must then use the Iron Boots to destroy them and head into the gap which leads into a hidden room where the Treasure Scope is located.
In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, the Treasure Scope had a slight change in design, where it was given a much larger lens.
The Treasure Scope was used by Rouge the Bat on her mission to the Special Zone. This version of it was equipped with a data-scanner, and when Feist appeared in front of Rouge and Shadow the Hedgehog, the former used the data-scanner and said that it was going "crazy" because of Feist's power levels.
The Treasure Scope in the Archie comics could be a reference to the Scouter from Dragon Ball Z.
In the Dreamcast version of this game, this Level Up Item was incorrectly called "Sunglasses." This was fixed in the GameCube version.
Although it was never mentioned in the comics, Ian Flynn stated on his message board that Rouge was sporting the Treasure Scope in Sonic Universe #4.
The Treasure Scope in Security Hall.
Rouge obtaining the Treasure Scope.
Rouge using the Treasure Scope to see the hidden items.