Keno is played by betting on the numbers that are drawn out of the total of 80 possible numbers. A player can bet on up to 15 numbers and the number bet and hit determines the payoff to the player. Players' possibilities are figured from 20 drawn numbers. The payout schedule is very generous and the better odds bets are between picking 5 to 8 numbers. This game online is played very quickly and the number of plays per hour can be very high. A player would be wise to set a betting limit before starting the series of plays. One of the old time plays is called the four-corner bet. The bet is literally playing the four numbers in the corners of the chart.