Without the green tiles in #7, there would theoretically be 13! = 6227020800 possibilities to align the tiles. However, the fact that the 3 green tiles give you five 1 out of 2 instead of 1 out of 13 alignments, this number is reduced to (13-5)! = 8! = 40320 possible constallations. Reaching one constallation per click, while a click takes 2 seconds due to the animation, results in 22,4 hours. If you make intelligent moves, you can quarter or even one-thent this time, so you can get lucky in even 2 hours! If you click as often as you can. (The number of possible alignments for this puzzle - IS (still) TOO DAMN HIGH!) I m not gonna try it on, while i think it s a nice puzzle. There simply is no single "this tile MUST be here because of this or that" halt where you can start, this makes it so difficult.