My grandson and I went thru the history portion of Lego Harry Potter: year 1-4, but since this doesnt have a game guide its difficult to get everything. We keep having to leave the black and red bolders, knight, stones, etc because we dont know how to break. I imagine it is like pirates that only blackbeard can break them. In Harry who breaks them? only voldermort? is there a cheat code to get him?