From the Super Mario Wiki
Mario walking in Moleville
Moleville is a town in Super Mario RPG: Legend of the Seven Stars where several moles live. When Mario, Mallow, and Geno first discovered the village, two mole children were lost in the Coal Mines, and Mario's agreeable party decided to help the lost youngsters. Along the way, they not only saved the children and defeated the insane Bob-omb master Punchinello, but they also recovered a Star Piece. The houses in the town seem to be modeled after tents and the town is mostly subterranean. Among the shop services in the town, there are also many local vendors, selling items such as fireworks, along with the Treasure Hunting Toad that is willing to sell his inventory at the shop. In Mario and the Incredible Rescue, Mario, Luigi, Toad and Yoshi come here to get the next Mushroom. There is also a hidden warp to Midas River here, accesible by giving a mole girl standing on a bucket a Carbo Cookie. She then hops off the bucket, giving Mario a warp to Midas River.
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