It's as easy as 123! Players add or subtract, 1, 2, or 3 to the number on the top card of the pile to determine if they have a card that can be played next. Sounds simple, but with everyone playing simultaneously, the options are constantly changing.For 2 - 4 players, ages 8 and up.Playing time: 5 - 10 minutes per game.Contents: 73 cards, embossed tin and instructions.