Kōchū Ōja Mushiking (甲虫王者ムシキング, Kōchū Ōja Mushikingu, lit. "Beetle Ruler Bug King"), known as Mushiking: The King of Beetles or Mushiking: Battle of the Beetles outside Japan, is a collectible card arcade game developed by Sega and released in Japan and other Asian countries such as the Philippines. The game involves battles between cards describing various species of beetle. The cards can be scanned in by a Mushiking arcade machine, which will both carry out battles and dispense new cards. It is the second trading card arcade by Sega following World Club Champion Football.As of 2008, more than 100,000 tournaments have been held, and 20 million cards have shipped. The game has made it into the Guinness World Records with the highest numbers of tournaments held for an arcade game.It has inspired several children's card games in arcades released by Taito, Sega, Konami, Bandai Namco, Takara Tomy, Atlus, and Square Enix.