Bolder Roll Over

[Guest7]

Now I am in the Spider cave, (past the cave with hole in ceiling. And thanks for the info on how to jump UP . I would of never thought to use the spacebar and the left mouse). I usually don't do these kinds of games.
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BUT Now---
I got cannot get past the rolling bolder. I know I have to smash the wooden plank-bridge (I read the walkthrough when necessary), but with what? I use the pickAx and the hammer, to smash the boards, butI still get rolled over.

I may end up being the person who used the most hours playing this game.
So far actual hours played, (and I do use the walkthrough, but only when necessary) is over 20 hours. And I am only about half way through.
I need a miracle :/