I've never used stride, but in "normal code" I would say you have to do the following things: a card class - a variable in the class which will be the same for a pair and different to the others - a getter method for this variable - a method to flip the card (change image) a world class - check if a click is made on a card (in the act method). flip the card (call the flipping method on the card) and save a reference to the flipped card. When a second one is clicked, compare the variable in the saved (first clicked) card to the variable in the just (second) clicked card. If they do not match, flip them back. If the match, don't. In both cases, remove the reference to the card