A card is selected at random from a deck of cards, you have to guess if the next card that is chosen at random will be higher or lower than the first card. If you get it right, you continue and guess if the next card will be higher or lower than the previous. You do this until you make a mistake or until the game is over.
If you want continuous gameplay where you can continue to guess what the next card is until you make a mistake, you can purchase the in skill product called "Continuous Gameplay". There is no end or maximum amount of guesses. The game continues until you make a mistake.