THE CARDSĪ Phase 10 box consists of 110 cards: 2 reference cards, 24 x 4 number cards in red, blue, yellow, and green, numbering from 1-12 twice. In this article, we will dive into how to play Phase 10 and all the rules you possibly need to know to play the game. Like Uno, in this game, you will also try to shed all the cards in your hand, however, unlike Uno, this is done through melding cards into phases. This game was invented in 1982 by Kenneth R. In Phase 10, there are 10 different matches or phases that must be fulfilled in order to win the game. Phase 10 is a card game from the company that brought us Uno, but it is played similarly to Rummy. This is a fun and challenging card game that involves some strategy.