There are 50 types of Fortune Cookies you can buy from Nookling General Stores for 2 Play Coins each. Play Coins can be earned by walking around with your 3DS on, with a total of 10 Play coins able to be obtained per day.

Each fortune cookie contains a random number relating to the prize. Once you've eaten the cookie, give the token to Timmy or Tommy Nook, and you might receive rare, premium items that cannot be obtained by other means. The fortune you receive will be rare, and the number of Fortune Cookies available will depend on how upgraded the store is.