In the 50 years since Ohio barber Merle Robbins invented Uno, the card game has sold north of 100 million decks. To bolster the game’s appeal, Mattel (which bought it in 1992) has stamped out an endless array of themed and licensed packs—473, by one count. These have included a Minecraft Uno, a Frozen Uno and a Harry Potter Uno. There are Uno packs themed around the Yankees, Cubs and Astros. There’s Batman Uno and Hulk Uno and Spider Man Uno. As of 2019, there’s even a braille Uno.