Pai Gow is an ancient Chinese domino game, believed to be over 2,000 years old. It is played with seven double-six dominoes, which are shuffled in on a flat surface. The aim of the game is to make two hands out of the seven tiles – five tiles in one and two tiles in the other. The five-tile hand's rank must be higher than the two-tile hand's rank. The game originated in the Southern provinces of China but is now popular across the world and is increasing in popularity in Costa Rica.