As you get more coins from playing the game, you can invest them on buying upgrades. There are two upgrades that affect the variety of spins you're probably to obtain, so make certain to buy them in tandem (rather of concentrating on a single one). Prior to leaving the game, make certain to invest a bit in the offline incomes upgrade as the cash you arrive accumulate truly quickly and help you get back at more upgrades for your spinner. The much better ratings you can get since the more upgrades you purchase.