UNO

Uno is a shedding-type card game designed for 2 to 10 players. It uses a 108-card deck with four colors: red, yellow, green, and blue. Each color contains numbered cards from 0 to 9 and several action cards. The objective is to be the first player to discard all of one’s cards.

On a turn, a player must play a card that matches the top card of the discard pile in color, number, or symbol. If unable to play, the player draws one card. If the drawn card is playable, it may be played immediately; otherwise play passes to the next player. The standard action cards are Skip (skips the next player), Reverse (reverses play direction), and Draw Two (the next player draws two cards and loses a turn). Wild cards let the player change the current color, and Wild Draw Four forces the next player to draw four cards and lose a turn. Some editions include variations and additional effects.

Players are required to announce “Uno” when they have one card remaining; failing to do so can incur penalties, commonly a punishment such as drawing extra cards if caught before the next turn.

History and editions: Uno was created in 1971 by Merle Robbins and later acquired by Mattel, which has continued to publish new editions and licensed variants. It has become one of the best-selling card games worldwide, with numerous spin-offs, themed decks, and digital adaptations for mobile devices, computers, and gaming consoles.