I really like the concept because it challenges my brain so I installed it I like the game but the amount of ads ruins it. Even if you pay to remove ads the app tries to coerce you into playing ads or spending more money. I'll finish a round in the game but instead of starting another game there's a button to play an ad to get more rewards and you have to wait if you don't want to watch an ad. App is constantly trying to make you spend money or watch an add. Waste of time!