Animal Slide Puzzle

★★☆☆☆ Has unsolvable puzzles so you will buy tile swaps. Lame. Edit to respond to developer response: I suggest the developers review their algorithms if they think that they ensure puzzles are solvable. A 4x4 puzzle is not hard to solve, and I've gotten it down to the last 3 tiles (bottom right corner) several times when they are impossible to solve. Furthermore, a tile swap would actually cause a solvable puzzle to become unsolvable, so offering them is only necessary if you've made unsolvable puzzles.