Buy the complete set. For the price of a coffee or a compelling snack from the store, you get days and days of relaxing levels with just enough challenge to keep your brain going. There are no time limit challenges. No scores. Not paying to continue. I've already passed 500 levels and was able to survive a few ... Honestly, this is one of my favorite games. It has a mix of easy, medium and hard difficulties rather than hitting you up to certain levels. Aesthetically pleasing Easy enough, you don't have to worry about throwing your phone out in frustration, but also challenging enough to keep your brain ... Super relaxing, music and gaming in general really helps me relax. There are some more challenging levels to get you thinking, but as I saw in another review, none of which are so difficult that you want to 'throw the phone against the wall'. There are not many ads too, which is very good. This is a lovely game, no time pressure, aesthetically pleasing and relaxing. Just what I was looking for. I don't care about ads as I know this is how these things are funded, but I wish ads weren't so complex to remove. I have a Mahjongg game that only shows an ad screen at the end of the game, ... Honestly, a great game, especially for downtime when there's nothing to do. I don't usually do reviews, but this is one of the few games on my phone that I really don't want to delete. And it's incredibly neat because (doesn't apply to all tweets), when I have a screen dimmer or my phone comes in ...