Paper Mario TOK game help. (Spoilers mid-game ish)

Blue

Plumbing my way into your hearts since 1985
So in Schorching sandpaper desert I'm trying to solve the riddles but I'm stumped. Can I get some help?
 
Have you found an area with a lot of walls scattered around? There should be a wall with waves engraved on it, and a fire place. Use Prof. Toad to dig there.
 
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