Mushiking: The King of Beetles (甲虫王者ムシキング, "kōchūōja Mushikingu"?) also called Mushiking: Battle of the Beetles, is a Japanese combination of an arcade game and collectible card game developed by Sega. The game involves battles between cards describing various beetle species. The cards can be scanned in by a Mushiking arcade machine, which will both carry out battles and dispense new cards.

The game has started a craze in Japan, where about 20,000 official tournaments have been held, and over 160 million Mushiking cards have been shipped. A Game Boy Advance Mushiking game has also been released, which has sold over 569,000 copies in Japan. There was also a Mushiking anime, broadcast by TV Tokyo, from 2004 until 2006.

Source: Wikipedia