What's the Sum? is an abstract summation card game for 2-6 players. The box contains 3 games with unique gameplay that makes each round of the game different from previous rounds.
In each What's the Sum? game, the players will try to zero the sum. Sounds easy? Let's try. If you succeed you can win, but the game can always change in favor of another player.
What's the Sum? games are fun, interesting and addictive, with clever gameplay. You will not want to stop playing and it will never get boring.
-description from back of the box
The three different variations inside the box all use the same 89 cards and Table Sum printed on the back of the front cover.
Classic Game: Players try to get rid of all their cards by adding and subtracting numbers in between -5 and 5, without going past the boundaries.
Advance Game: Players strive to reach one card in their hand as they lay a series of cards down to "zero" out the top-most visible card in the deck.
Fast Pace Game: Played just like the Advance game, with the exception of no turns. Players need to play their series of cards as soon as they can before the others.