5 stars: Not loaded with ads. A short ad before you play a round and not another. A round takes anywhere from 5 minutes to 15 minutes to play. Very acceptable. Daily challenge keeps it fresh. I only wish there was a different challenge for each difficulty but I'm not complaining as far as free games go it's a good one.
5 stars: I've been playing this game daily for years. The ads are not ridiculous but the game is absolutely worth the miniscule amount of money to remove ads! Over the years I've unlocked every game and finished challenges daily. I've never had a problem with the app and this game helps lull me to sleep every night while also being fun and challenging. What more could you ask out of a game?
4 stars: I love the smoothness of play. Very simple and fun. I think at some points the game is trying to teach me another possible play, but I have no clue what is happening when this takes place. Maybe some clearer instructions on that. Also there seems to be a big skill level jump from easy to medium. I'm not about to try hard yet. Simplistic and that's just fine with me.
4 stars: The game is great, but if I play a 2nd game. The commercial finishes and it just hangs there with >> in the corner, no x every time. Than I need to exit program and re-start it. I play many games and this has never happened.
3 stars: Decent but could use improvement. Seems like the computer often has an advantage and the levels from Easy to Expert don't seem to align with the act...