In Summer 1960, you want to empty your hand to score as few points as possible.
To set up, lay out the nine flower cards in a 3x3 grid, and deal each player a hand of seven cards. On a turn, play a card onto the matching flower space — but only so long as the number on your card doesn't already appear in that row and column. If you can't play a card, draw from the deck, playing it immediately if possible and otherwise adding it to your hand.
If you notice three cards of the same number on the board, whether after you play or on someone else's turn, you can call "Trio" and claim those cards from the board.
When a player's hand is empty, everyone sums the value of cards in their hand, then subtracts 1 for each trio they collected.
For the second round, the only change to gameplay is that when someone collects a trio, you discard those cards, then give the cards in your hand to your left-hand opponent.
After two rounds, the player with the lowest score wins.