This is pretty cool and it's surprising how well it works on mobile. I think the shuffle puzzle game has a bug where it can generate unsolvable puzzles. I ran into a parity issue. I solved it with the blank in the upper left but got no response from the game so I don't believe that was the intended solution.
Also checked with an online solver and it verified that there was no solution.
Also checked with an online solver and it verified that there was no solution.