Tenacity is a quasi-real time arithmetic game. Each turn, a player plays a card to a central stack and announces the sum of the cards in the stack - the card they played and the number said by the previous player. Each player has a face down "target" chip in front of themselves. If the number announced matches a player's target, the player should grab a stone from the middle of the table. Once the other players see someone grab a stone, they all try to grab a stone as well. The player who is not able to grab a stone takes the cards from the central stack as a penalty. The game ends when the deck of cards or target chips are exhausted and the person with the most points wins.

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