Uno is an American card game that is played with a specially printed deck (see Crazy Eights for a family of games very similar to Uno but played with normal playing cards). The game was originally developed by Merle Robbins in Reading, Ohio, a suburb of Cincinnati. It has been a Mattel brand since 1992. The game's general principles put it into the Crazy Eights family of card games.
The deck consists of 108 cards, of which there are 25 of each color (red, green, blue, and yellow), each color having two of each rank except zero. The ranks in each color are zero to nine, "Skip", "Draw Two", and "Reverse" (the last three being "action cards"). In addition, the deck contains four each of "Wild" and "Wild Draw Four" cards.
To start a hand, seven cards are dealt to each player, and the top card of the deck is flipped over and set aside to begin the discard pile. The player to the dealer's left plays first. On a player's turn, they must do one of the following:
- play a card matching the discard in color, number, or symbol
- play a Wild card, or a playable Wild Draw Four card (see restriction below)
- draw the top card of the deck
- Play proceeds clockwise around the table.
Card and effects -
- Skip : Next player in sequence misses a turn
- Draw Two: Next player in sequence draws two cards and misses a turn
- Reverse : Order of play switches directions (clockwise to counterclockwise, or vice versa)
- Wild : Player declares next color to be matched (may be used on any turn even if the player has matching color)
- Wild Draw Four : Player declares next color to be matched; next player in sequence draws four cards and misses a turn.