Uno is a game for two to 10 players and requires a specialized deck of cards. The dealer deals seven cards to each player, face down, and places the leftover cards face down on the play surface. To initiate play, one player turns over a single card in the center.
The player to the dealer's left plays a card that is either the same color or number as the card in the center. If the player does not have a viable card or a Wild card, he draws a card from the face down pile. If the player cannot play the card he draws, he passes to the player on his left.
Play continues in this way until one player has one card remaining and calls out "Uno." If the player forgets to call it, another player can penalize her by making her draw two cards. The first player to discard all of his cards wins the round.
Each discarded card is worth a particular number of points that are tallied at the end of the round. The numbered cards are worth the same value in points. All of the action cards except for Wild cards are worth 20 points. Both types of Wild cards are worth 50 points. The game continues until one player reaches 500 points.