I would love to give this 5 stars. It is a fun trivia game to play. However, in order to play a puzzle you must spend 500 coins. Doesn't sound bad, except the payout of winning a puzzle doesn't always make up for it. So you're forced to pay actual money for coins or watch ads until you feel like you have enough to play another puzzle. You also get to watch an ad after every puzzle. I'm not opposed to ads, but it gets excessive and it's just not worth it.