I think he's referring to that one room where you put the gems in (in a certain order), and there's a rumble, and when you leave the room, it's different.
And I don't think PH has an "official" guide; NoA stopped making them (probably because Nintendo Power is now by Future US), but there is an "offical" Prima guide for it--and every other major Nintendo game lately--as I think they took over the job now.