The game is fantastic, but also rife with ads. I don't mind that there's constantly a banner ad on the bottom of the screen while I play it, but they also slap an unskippable timed ad on the screen every few puzzles. You're wasting my time to make the experience worse to try and coerce me into swiping my credit card. I've made my peace with seeing ads in free games, but shame on any developer who loads their app with ads that intentionally waste my time or try to get me to click by accident.