Yu-Gi-Oh used to be a popular card game people used to play. It's popularity decreased majorly over the years. Basically people would battle with cards and there's a set of rules for it on how to paly. People mainly just liked to collect the cards rather then play. Card games for Pokemon and Naruto aren't really too popular since the series isn't based on cards. When I was younger I used to collect cards since Yu-Gi-Oh was popular back then. I don't have any interest in it now since it got ruined by the new generations of Yu-Gi-Oh.