San Gimignano is a small city in Tuscany, Italy famed for the 72 medieval towers built by families to exhibit their wealth and influence. In Le Torri di San Gimignano, a.k.a. サン・ジミニャーノの塔, each player represents a noble family in medieval Tuscany who is trying to build more towers that are higher and more beautiful than those of your rival.
Players start with five cards in hand and four cards in a face-up market from a deck that contains five 5s, six 6s, and so on to ten 10s. They draw and swap cards from an open market, looking to lay out cards of the same value (a plain tower) or of rising values in a run (a colorful tower). Players can add to existing towers, too. After building a plain tower, they receive a bonus effect (a donation) based on the rank of that tower. Players can complete towers by setting them aside as an action; they can no longer add to these towers, but each scores an additional 5 points at game's end.
In the final scoring, players score for having the highest tower, for plain towers that are taller than the opponent's tallest tower in the same rank, and for their colorful towers (# of towers x # of floors total in these towers). The player with the highest score wins.
The game also includes a set of noble cards for an advanced game, with the nobles having special effects in the game.