Uno (pronounced /ˈuːnoʊ/; from the Italian and Spanish word for 'one') is a card game played with a specially printed deck (see Mau Mau for an almost identical game played with normal playing cards). The game was originally developed in 1971 by Merle Robbins. It has been a Mattel product since 1992. The game's general principles put it into the Crazy Eights family of card games.
The deck consists of cards of four colors: red, green, blue, and yellow. The ranks in each color are 0-9. There are three "action" cards in each color, labeled "skip", "draw two", and "reverse". There are also special black action cards, "wild" and "wild draw four". There are two copies of each colored regular and action card, except for the zero card, which only have one per suit. There are four "wild" and "wild draw four" cards each, producing a total of 108 cards. In older versions, only the 6 is underlined to distinguish it from the 9, which is not marked; newer versions have both the 6 and the 9 underlined to further distinguish the two ranks.
Before playing, a dealer must be selected. This is accomplished by drawing cards. The person with the card of the highest face value is the dealer. Only number cards are used for this purpose. Any other cards are then put back into the deck.
After the dealer has been selected, seven cards are dealt to each player, and the top card of the stock is exposed to start the discard pile. If the exposed card has a special ability, it is treated as if the dealer played that card, and the special effect occurs (i.e., skip, draw two, reverse, or wild). If the exposed card is a wild draw four, however, it is returned to the deck and the next card is exposed. Play begins with the person to the left of the dealer, i.e. clockwise.
At each turn, a player may play a card from their hand that matches either the color or rank (or both) of the top exposed card, or play a wild or wild draw four.
If the player doesn't have a card to match the one on the DISCARD pile, he/she must take a card from the DRAW pile. If the card picked up can be played, the player is free to put it down in the same turn. Otherwise, play moves on to the next person in turn.
Alternatively, the player may choose not to play a playable card from his/her hand. If so, the player must draw a card from the DRAW pile. If playable, that card can be put down in the same turn, but the player may not use a card from the hand after the draw.
After playing a single card or drawing, the next player clockwise takes a turn, or counter-clockwise when a reverse is in effect. If the stock is emptied, the discard pile is shuffled and turned over to replenish the stock.
When a player plays down to only one card, that player is required to yell "Uno" to warn other players. If the word is not said, and another player points out the error, the original player is busted and has to draw two cards from the DRAW pile. The hand is over when one player has discarded all of their cards.
After a player plays all their cards, the other players count the number of points pertaining to the values of the cards in their hands. Number cards are face value, colored special cards worth twenty, and wilds worth fifty. The first player to go out receives points for the cards left in his/her opponents' hands. The first person to reach a certain point value (officially 500) wins.