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Uno was invented in 1971 by Merle Robbins, an Ohio barber who designed the custom deck to settle an argument with his son regarding the rules of *Crazy Eights*. After initially selling copies out of his barbershop, the rights were acquired by International Games (and later Mattel), transforming it into a global household staple. The game belongs to the ancient "shedding" family of card games, sharing its DNA with the traditional *Crazy Eights*, the German game *Mau-Mau*, and the European *Macau*. While Uno standardized the genre with its distinct colorful deck and proprietary action cards, its core mechanic of matching colors and numbers to empty one's hand is a direct evolution of these public-domain classics.