From the Super Mario Wiki
The SandWorm sticking its head out of the sand.
| First Appearance
|| Wario World (2003)
The SandWorm is a worm-like boss in Wario World. It is the boss of Greenhorn Ruins, and the second of the three bosses in Excitement Central (the others being Greenfist and Dinomighty.
SandWorm is fought in a large sand pit that continually pulls Wario towards the center. Its main attack is spitting spiky balls at Wario; Wario can easily damage it with repeated punches. SandWorm cannot be stunned; when it loses one of its health skulls, it instead slashes after Wario with its scythe-like hands. Also, SandWorm may burrow to the center of the arena and start spitting many spiked balls in random directions. When this happens, the sand pit pulls Wario in much faster. If damaged enough, it will also strike back with more powerful moves, including slicing Wario with its hands. Defeating the SandWorm gives Wario access to Dinomighty.
The SandWorm also appears in Pecan Sands, where its attacks are a bit faster, but it is fought and defeated in the same way.
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