Magnifying Glass (Super Mario World 2: Yoshi's Island)

The Magnifying Glass is a Special Item used for finding Red Coins in Super Mario World 2: Yoshi's Island and its remake Yoshi's Island: Super Mario Advance 3. It can be found in any of the Bonus Challenge games and, when used, its effects continue until Yoshi either loses a life or reaches the end of a level. The Magnifying Glass detects Red Coins that are disguised as Gold Coins and turns them red and visible to the Yoshi so he may more easily collect all twenty Red Coins in the level. The Magnifying Glass will also reveal Winged Clouds that are otherwise invisible, except Winged Clouds that are only revealed by rolling a Chomp Rock or Snowball over their locations.

Yoshi's Island: Super Mario Advance 3

 * Nintendo 3DS digital manual description: "Reveals hidden Red Coins."