Mario & Luigi: Superstar Saga Hints

It is yellow colored-bean. They can be obtained by playing the Mini-Game throughout the adventure. If you always wanted a new gizmo from Professor E. Gadd that is.

Go to the gwarhar lagoon cross section and go up.there should be a surfing part.make luigi a surfboard by smashing him.then go up,right,right right.then you should reach an island with a purple guy on it.when you find that,go up once and you should find a secret minigame.good luck