The goal of the game is to remove all the cards in the blue, cards in the yellow are just helper cards. Jokers remove all cards. How do you remove cards you might ask? Well combine black suit card values (Spade and Club) with red suit values (Heart and Diamond) to add up to Zilch!
So as an example, combine a black King (value of 13) with a red 8, 2, and a 3. Make sense? The app helps you by showing the current values of the cards you have selected, and even turns green when you can remove the cards! Trust me, this game will be tough to put down.