The Yu-Gi-Oh! card series is a collectible card game created by Kazuki Takahashi and is based on the fictional game of Duel Monsters. The series was first released in Japan in 1999 and has since gone on to become one of the most popular trading card games of all time. Players construct decks of 40-60 cards and battle their opponents using monsters, spells, and traps. Each card has unique artwork and abilities, with rare cards being highly sought after by collectors. The game has spawned numerous spin-offs, anime series, video games, and other merchandise. Yu-Gi-Oh! is beloved by fans young and old, making it one of the most successful card games in the world.