ROYAL CARIBBEAN is a single pay-line slot machine, which means that payouts occur on the center pay-line only. Royal Caribbean slots has an auto play feature where you can set the slot to play up to 500 spins and select the number of seconds between spins. 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.