Edit: I've now played this through just over 100 levels. It's basically an ad delivery mechanism with a little bit of game play time. I enjoy the challenge and it's a nice change from the typical match 3 games that are all over. Very heavy on ads, I'm ok with ads between levels but the ones in the middle of play are just plain annoying.

I'm up in the 300s, number of unique puzzles. It's challenging and will expand vocabulary, as some combinations are of esoteric things like fancy pasta and varieties of cheese, food from around the world. The subjects are wide ranging, science, math, history, literature. I have only occasionally been lost enough to need more than three hints. Hints cost an ad each, and there are ads between levels and when you have been on for a while. It's not too much.

The app is fun but I'm giving it one star for having ridiculous ads. It has ads that take over 4 clicks to exit and it has ads what open up a browser page with no warning. You don't have to watch too many of them but the quality of ads is terrible. I've never had an ad that opens in a browser and not in the app itself before I played this game.