Deal all cards so that all players have the same amount of cards. Keep cards face down.
Determind what wins each round. Options include largest or smallest number, the largest sum, difference, or product. Players flip over their top card at the same time. If looking for largest or smallest number, flip over one card. If looking for the sum, differnce, or product, flip over two cards. The player who loses the round gets all of the cards. If there is a tie, keep the cards in the center and play another round until someone loses, and they will get all of the cards.