Hidden Treasure

An old Toad telling Mario to jump beside him; this action results in revealing a Surprise Box.

A Surprise Box is an invisible Treasure Box found in the game Super Mario RPG: Legend of the Seven Stars. Mario learns about Surprise Boxes from an old Toad living in the basement of the Mushroom Kingdom Item Shop. By jumping, Mario can discover the location of the invisible treasures. A friendly Chester in Monstro Town provides Mario the number of Surprise Boxes to be found in the game. Later in the game, Mario can collect and equip an Accessory from Croco, the Signal Ring, which makes a noise whenever he's in a room with a Surprise Box.

The concept of hidden containers are carried over with invisible ? Blocks in the Paper Mario and Mario & Luigi games.