7 Ate 9 is a new speed card game from Out of the Box Publishing. Each card has a big number in the center (the number of the card) and a +/- # in the corner, such as +/-1 or +/-3.

You simply have to slap down a card on top of the pile such that the number of the card you play matches the equation on the previous card, either + or -/. First to run out of cards wins.