Phase 10 can be played by as few as two players and is ideal for individuals seven years of age or older, making it a great addition to a family game night. Learn more about Phase 10 and find out how some clever variations can make the game even more fun. Phase 10 rules are easy to master, making this a great game to play with children, but it is still competitive enough to be enjoyed by adults. This family card game is similar to rummy, but it requires a specialized deck. Phase 10 is a card game that was developed in the early 1980s and was later sold to Mattel.