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In Allegra, based on the public card game "Golf", you will want to keep your score as low as possible, but to do this sometimes you must help your neighbors along the way.
The deck is comprised of cards numbered -1 to 11, and in each of the three rounds, each player begins with twelve cards face down in a grid of four columns and three rows. Your rightmost column is also considered to belong to your right-hand neighbor, and likewise your area also includes the rightmost column of your left-hand neighbor. Each player reveals any two cards in their area, then the round starts.
On a turn, you either take the top card of the deck and reveal it, or draw the top card of the discard pile. If you draw from the discard pile, then swap that card with any card in your area, then discard the replaced card. If you draw from the deck, you may discard that card (turning any card in your area face up) or you can swap that card with any card in your area.
If you draw from the deck, any other player can knock on the table to indicate that they also want this card. You can choose to ignore the knock, or you can give them the card; in the latter case, they then replace one card in their area with this new card, taking the old card in their hand. You will then take any one card in their area and swap it for a card in your area, discarding the replaced card. The other player then put the card in their hand into the hole you created when you took one of their cards.
Any time you have three of the same card in a row or column — even a row that includes a card in your left neighbor's rightmost column! — you discard those cards from play.
Whenever a player has all their cards face up, each other player takes one more turn, then players sum the value of the cards in their area (which includes any cards remaining their neighbor's rightmost column). If the player who triggered the end of the round does not have the lowest sum, their sum is doubled. The player with the lowest total score after three rounds wins the game.