Big Boo Flag

The Big Boo Flag is a special item hidden by The Big Boo in Super Mario RPG: Legend of the Seven Stars. When visited by the 3 Musty Fears, Mario is told by The Big Boo that the flag he hid is "between 'O' and 'A'." The invisible flag is found by pressing the A button between the "O" and "A" in the word "GOAL" at the end of the Mushroom Derby racetrack on Yo'ster Isle.