In Line Up!, you start with a line of cards on the table, with as many cards as players. Each turn, players pick a card from their hand and simultaneously reveal it to make a new line, ordered from the lowest to the highest card. Each player then takes the card in the previous line at the same position as the one they just played, adding it to their tableau. These cards will score points at the end of the round, depending on their color and the order they were picked. After being scored, they become the player's hand for the next round.