I sort of dont get it!

I like it, but I dont understand what determines whether a piece of ground will collapse. It seems totally random and I cant really figure out how to know when I should be cautious or not.

UPDATE: I think Ive realized finally that the trick is to take it slow. Im still terrible, but this is always my go-to iPhone game when Im bored.

UPDATE 2: Still the only game I consistently re-install whenever I restore my iPhone. I still dont really get it, and I feel like I am terrible at it, but its still fun for some reason! The developers recent update about how he plays his own game all the time and tries to make it more fun according to his needs really resonates me as a indie game developer myself.

Amiantos about Doug dug.