PROGRESSIVE PAY DIRT is a single pay-line progressive jackpot slot machine, which means that payouts occur on the center pay-line only and you must play the maximum bet to win the JACKPOT. For every coin that you put in you increase your payout. When the reels stop spinning the symbol combinations along the center pay-line are checked. You get paid out for any winning combination falling on the pay-line. The following are non-paying symbols in PAY DIRT: STAR, 4-LEAF CLOVER, DOLLAR BILL.