Spade Panel

From the Super Mario Wiki

Spade Panels are small panels far from towns that Toad stores lives and helpful items for the Mario Brothers. They are shaped like Mushrooms and in Super Mario Bros. 3, a slot machine game is played. There is a Mushroom, a Fire Flower (which were blue), and a Star. If even one of these were aligned wrong, the plumbers would not get anything. However if one of them gets a Mushroom matched up correctly, they would gain two extra lives. If one of them got a Fire Flower matched up correctly, they would get three extra lives. If one of them got a Star matched up correctly, they would gain five extra lives. This is similar to the panel card gained at the end of each level.

In the Game Boy Advance version, if a spade panel is matched up correctly, the remaining Spade Panels will change to Heart Panels and will be a slightly different game in which the Stars are replaced by Super Leaf and would gain 7 extra lives if lined up correctly.

If Mario succeeds at clearing a Heart Panel, then all the remaining Heart Panels will become Club Panels, and the Super Leaves will change to "3" icons, which reward 10 lives when lined up correctly.

Upon clearing a Club Panel, the remaing Panels will turn into Diamond Panels, where only one possible picture can be lined up, making it impossible to lose. Earing a minimal amount of lives at previous Panels will result in a Mushroom picture, while higher amounts will yield better ones.

If Mario clears a Diamond Panel, or fails at any of the other ones, then all Panels will revert back to Spade Panels.