This game is quite scummy. I pre registered for the game and more than half of the items you get aren't permanent and have a 30 day trial to use them. You don't get much of coins unless they're extremely expensive and micro transactions are a thing and you necessarily need to pay to get new cars and gear for your character. The mechanics for a kart racer are quite good for mobile but micro transactions and kids do not work well together with their parents phone which would seem to be the case.