I’ve spent countless hours mastering this puzzle. Initially the easy puzzles were fairly easy but the hard and expert puzzles were impossible without brute force trial and error. After playing the easy puzzles for several months I learned enough that the hard puzzles were getting solvable. I then spent a year solving the hard puzzles over and over again until relatively recently when I graduated to the expert puzzles. Just finally bought the expert expansion and I can generally solve any of those. Many seem quite easy now. But it took me forever to spot all the different patterns to get to this point.

Very addictive and in general very well implemented.Yes, there’s no hint button, but you can of course guess and try again.My complaint is about the order/sequencing of puzzles. I’ve solved (or ok, in a couple of instances guessed) all the easy set and about 20% of the hard level, but although I can solve or make progress with some, I get stuck on some, and would prefer to bypass the hardest ones and come back to them later, hopefully after having learned new techniques that make them solveable. Instead, I keep getting rerouted to the same 15 or 20 that I’ve gotten stuck on before, and have to ask for a new puzzle dozens of time before arriving at a fresh one. A completely randomized order would be so much better.

I came here to leave a 3-star review because after I bought the extra expert puzzles they were so easy. You didn’t put the effort to make them as good as the free ones. They are not half as good as them. Expect for this, this is by far the best mobile game that I have played. The free puzzles were amazing. So, I could not get myself to give you a three star review. I love this game. Please show us respect by making the paid ones as good as the free ones. I love your game. Keep up the great work.

I love the app. My only complaint is that there is too big a gap between “easy” and “hard”. I can solve all of the easy ones very quickly, including the add-on batch that I purchased, but I still can’t solve the hard ones at all, except occasionally via a lucky guess. I can’t even imagine what “expert” must be like. I would like to see an “intermediate” class that is hard enough to be interesting without being completely impossible for someone relatively new to the game. Alternatively (or in addition), the built-in tutorial could includes some tips on advanced techniques relevant to the “hard” and “expert” puzzles.