CARD GAME YELL is a popular game that is often referred to as UNO (3 letters). It is a card game that is played with a specially-designed deck of cards. Players take turns playing cards from their hands, trying to match the color or number of the previously played card. The goal of the game is to be the first player to get rid of all their cards. When a player has only one card left, they must yell 'UNO' to alert the other players.