Walk below the town
First, get a turbo nozle in the town square. Now go over to where all the fruit venders are. Stand between the pepper stand and the pear/pineapple, what not stand. There should be a Shadow Mario poster on the wall between them.
Now, turbo along the wall behind the pear/pineapple stand. If done correctly, Mario should Turbo through the wall. Keep going to you hit ground. Look up. Pretty neat, huh?
To get back up turbo and jump to where a underground passage is. Do not run out of water!
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