The game is fun, addictive and ad free. However, your success in the game is dependent on you buying boosters and coins. Without the ability to buy these things you can be stuck on one level indefinitely which is NOT fun. I recently discovered this because I'm playing on an old phone because I didn't want to lose my progress. The old phone has wifi, but no internet. You can't purchase anything without internet, so I've been forced to replay the same level continously. Boring!