I have, who has exponents and square roots is the classic game. There are 30 'cards'. I have formatted these with the Word Label Maker to print onto 2x4 shipping labels. This way you will be able to peel and stick them onto notecards and hand them out. The first/last card is labeled with an asterik so you know where to start. If you have less than 30 kids just give some of them more than one card.