There is no optimal number of Keno spots you should pick. The numbers you choose dynamically adjust the payouts and getting 4 matches out of 8 chosen numbers doesn’t have the same payout as getting 4 matches out of 4 chosen numbers. It depends on your desired level of risk and if you’re in pursuit of the highest payouts. If you’re wagering a bonus, we recommend to play it safe by choosing between 4 to 8 numbers.