if you pick the number 8 for instance, it's black, so you select black. The next step about picking one of the color blocks is irrelevant. then you pick the house with the number in it. 8 is the only number in the house that was black the others were 14, 17, 20, 25, 28 none of them were black, so it eliminates them (28 wasn't even a choice) so 8 is the only number in the house that was black so it has to be your number. the crystal ball part is irrelevant. the first door selected will automatically have your number regardless of which door you select.