BEST app have found in a long time! Challenging enough to make it interesting but still calming and enjoyable. Love how the puzzle comes to life when it's done. And ads are not that bad, take a breath and relax! UPDATE: Lowered stars from 5. Now instead of ads between the puzzles they're smack in the middle of the puzzles, completely changing the calming dynamic of the game, now it's become quite irritating. Scouting out a new game UPDATE: ah, THE WE ARE CHANGING NOTHING CANNED REPLY.