I rarely write reviews but I decided to finally get around to doing this one. I want to commend the developers, I bought this game when it very firstly came out and am constantly impressed. They constantly come out with new puzzles even years later, its never glitchy, easy to sync with other devices, and the puzzles are solvable unlike other picross games out there. So much time and effort has obviously been put into this app and I highly recommend them and the company who stands behind it. Thumbs up.