This freebie includes cards which can be used to play quadrilateral memory. I suggest having students complete this activity in groups of 3-4 people. Because of the hierarchy of quadrilaterals, cards can match more than one card, so the outcome of the game can vary and all cards might not be used. In my classroom we use the goal of the first person to make 4 matches wins or you can play until no more matches can be made. The student with the most matches wins.