Tropic reels is a 'multi-spin' video slot machine, meaning there's more than one set of reels on the machine, and you'll have a chance to match symbols on each set of reels. There's 5 reel sets in total - and each 'spin' begins with setting the first set of reels along the bottom. After the first set of reels is done spinning, you have the option of holding any symbols you'd like. Any symbols you've held will appear on each of the 5 reel sets. You then spin again - and all reels that do not have held symbols will spin until the game is set. It's a fun diversion from 'regular' slots, and the act of holding symbols allows you to 'go' for particular matches more often. Definitely worth a try if you haven't experienced it before. .