Duo cards is a card game inspired by the famous and consecrated Uno. See the rules: The deck consists of four-color cards: green, yellow, red and blue. The rows of each color vary between 0 and 9. There are three special actions for each type of letter color, identified as “Jump “, “buy two ” and “Flip “. There are also special stock cards with black background, “Joker ” and “Joker buy four “. For each regular or action card, there are two of them in the deck, with the exception of 0, which only has one unit. There are four “color-changing wild cards ” and four “wildcard buy four “, which results in a total of 108 letters. To differentiate September 6, an underscore is used underneath the respective chart.