It does the usual, match 3 in a row swapping for coins you can use to buy tank decor and fish. But it only VERY rarely does any "mini games" and they're usually ridiculously easy, only 3 or 4 steps and don't actually reward you with anything decent. If you want a matching game OR to decorate fish tanks, this is your game. But DON'T go by any of the ads for it.