Menko is a traditional Japanese game that involves colorful, flat, circular cards made from paper or cardboard. Players take turns throwing a card to flip over their opponent's cards, aiming to win them. The game is often played on a flat surface, and the player who flips the most cards wins. The cards used in menko often feature popular characters from anime, manga, or video games, making them appealing to children. While it has historical roots dating back to the Edo period, menko remains a popular pastime in Japan today, enjoyed by both kids and adults.