UNO is an extremely popular world-wide card game, which has been ported to a variety of platforms over the years.
There have been a number of different games released with the UNO branding that draw on elements of the original card game's play style. This involved each player following the color or number of the previously played card until a player could play his or her last card. If a legal play was not available, the player would have to draw a card. There are number of special cards to affect the flow of the game or to make other players draw cards. When reaching one card, the player had to call "Uno" or else draw cards.