Reverse card, Uno Wiki

A Reverse card is a card found in the standard Uno deck that comes in all of the four colors: Red, Blue, Green, and Yellow. When this card is played, the order of play is reversed. If Reverse cards are "stacked," the direction of play may either continue in the way that it was before the Reverse cards were played, or it may actually reverse. Whenever an even number of reverse cards are played, the Reverse cards will cancel each other out and the direction of play will continue in the way that it

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