Soda Star

The Soda Star (ソーダスター, Sōda Sutā) is a special star that appears in Super Mario-kun, in chapter 12 of volume 2.

Luigi gets intoxicated by a Volcano Lotus's powder, which turns him into stone. Yoshi and Mario forces the Volcano Lotus to turn him back, but it reveals that it cannot, but says that maybe the Soda Star, located at the bottom of Soda Lake, can. Later, Mario and Yoshi return from their trip from Soda Lake with a star and place it on Luigi, but only then do they realize it is a normal starfish: the real Soda Star still rests at the bottom of the lake.