Just like water turns into ice at 0°C and into steam at 100°C, at certain fixed temperatures, the behavior of substances dramatically changes. This is called a phase transition.
The Phase is a game that combine this universal physical phenomenon of three states of matter with trick-taking mechanics for 3 to 6 players. Just like ice turns into water, the game features changing states, referred to as "phases," during which the rules also change.
Starting with the dealer, each player plays a card in turn. The person with the lowest number is "1st," and the second lowest is "2nd." The "1st" player wins the card with the highest number present, while the "2nd" player wins the card with the lowest number. This round of play is called a "trick." Keep the cards you win in front of you. After a trick is completed, the "1st" player becomes the dealer for the next trick.