5 stars: After my first review as seen below, the ads decreased. I love this game. It relaxes me & passes time when need be. I do wish there was a point system to get rewards like music or theme or skins, etc. Overall though I like it. Previous rating 3 stars: I enjoy this app but the ads r becoming longer and more frequent. Becoming annoying but will continue to play
4 stars: Enjoying so far. At about Level 5 the ads begin... I am thankful however that it's been only 1 ad at a time. Presently I'm on beginner levels where those games are pretty short and don't last long- so having an ad after every single game (level) is getting to be a bit much. But at least it's only 1 ad, and so far they're short...I really hope this cycle does not increase in ads as your levels increase.
4 stars: I'm newly addicted to the game. I especially play for the daily games. The number of ads that interrupt play are insufferable. Also....there is no explanation of how and when to use the coins you're awarded, or why you need them.
3 stars: Good concept. Starts simple so it takes multiple levels to reach anything resembling a challenge. Way too many ads that are very long between each easy level. it's frustrating when the level takes 5 seconds to complete and 30 seconds of ads. Uninstalling.
2 stars: As others have stated, the ads in the challenges are extremely disappointing and cause the app to restart, often restarting the challenge level. This is so much fun but all the ads are ...