In Paper Mario: The Thousand-Year Door, I am stuck in Twilight Woods. There is a large boulder blocking the path.
Prior to this boulder, there is a depression or darkened area on the ground. I used Flurrie to blow away the masking paper, revealing wooden slats blocking a tunnel that I have ground-pounded into.
Going through the tunnel places Mario into the background, where another bolder blocks the way. This background rock is too high to jump over, and since I am in the background, I don't have access to any companion utilities. No game mechanic introduced so far seems to work here.
How do I get past this boulder?