From back of box: Easy to pick up... impossible to put down! Race to get rid of all your cards. Match colors or numbers. Use the action cards or house rule cards against your opponents. When you're down to one card, don't forget to yell "UNO!" These 4 extra cards are game changers! Play the "Swap Hands" card to change hands with any opponent! 3 Customizable cards let you write any house rule you want! Customizable cards erase to make new rules.