It's not often I rate a game with 5 stars. Though there are microtransactions and pay to win aspects within the game, I haven't paid into the app yet and find that those who have are not impossible to defeat. Gems are awarded in good quantity for a wide variety of activities so theres hardly any pressure to purchase anything. I haven't seen an ad yet which adds to the appeal. The "Sleep Mode" is a stroke of brilliance and i am very impressed. If you stick with it, progression is well paced. 9/10