Fossil Fighters, known in Japan as Bokura wa Kasekihoridā (ぼくらはカセキホリダー lit. "We Are Fossil Diggers"?), is a 2008 video game developed by Nintendo SPD, Red Entertainment, M2, and Artdink and published by Nintendo. It was first released in Japan on April 17, 2008 and was later released in North America on August 10, 2009, and in Australia on September 17, 2009.
On September 10, 2010, a sequel titled Super Kasekihoridā was announced, and it was released in Japan on November 18, 2010. Near the end of Nintendo's E3 2011 conference, it was announced that it would be released outside of Japan originally titled as Super Fossil Fighters, but later changed to Fossil Fighters: Champions. It was released in North America on November 14, 2011. At E3 2014, Nintendo casually announced the first entry on the Nintendo 3DS, Fossil Fighters: Frontier, released in North America in 2015, the game has been available in Japan since February 2014.