I'm no web designer and as such, I'd never be able to build that, so well done

As for the "trick" per se; it's only like putting 3 piles of 9 cards down and asking the spec which pile their card is in .... etc .... 3 x 3 x 3 permutations = 27 ... the same number, as the number of cards in the "trick"
.... by the way - I'm content
