Universe 6 (第6宇宙, Dai roku Uchū), the Challenging Universe (挑戦の宇宙, Chōsen no Uchū), is the sixth of the twelve universes in the Dragon Ball series, it includes planets, stars, a large amount of galaxies. Universe 6 is linked with Universe 7, creating a twin universe. Being a twin universe, almost identical to Universe 7, any planets that have existed and/or exist in Universe 7 will also likely have existed or exist in Universe 6. The majority of planets are unknown, but it is known that Universe 6 has an Earth, but it had been ravaged by war with the Earthlings on that Earth, which rendered the Earthlings extinct, until Beerus revived the planet, and all of its inhabitants, with the Super Dragon Balls. Planet Sadla, which was destroyed in Universe 7, still exists in Universe 6. It is the universe with the tenth highest mortal level.