Uno Card Game

Uno is a card game played with a specially printed deck -- it consists of cards of 4 colors: red, green, blue, and yellow. The ranks in each color are 0-9. There are 3 "action" cards in each color, labeled "skip", "draw two", and "reverse". There are also special black action cards, "wild" and "wild draw four". Be the first player or team to score 500 points. Points are scored by being the first to rid yourself of all the cards in your hand before your opponents.

The game was originally developed in 1971 by Merle Robbins. It is now a Mattel product.