Publication Information
- HomeWorld : A.R. Worlds
- Japanese : A.R.世界
- Version Of Reality : Another Rider's/Alternate Reality World (A.R. Worlds)
- Season : Kamen Rider Decade
- Main View : Full Episod
Originally, Tsukasa only knew that their destinations were nine A.R. Worlds to finish their journey. As the story progressed, they realized that their journey doesn't end at the ninth world, but further more towards new worlds, until Decade connects these worlds' stories through him. The A.R. worlds are alternate realities in Decade's point of view.
The characters of Kamen Rider Decade exist amongst various iterations of reality within the series referred to as an A.R. World (Another Rider's/Alternate Reality World). The Nine Worlds are the A.R. Worlds that are based on the previous entries of the Kamen Rider Series that have aired during the Heisei period of Japanese history. Each differs in some way from the series on which it was based. The New Worlds are the A.R. Worlds that are not based on a previous entry of the Kamen Rider Series from the Heisei period.
The Nine Worlds
- The World of Kuuga (native world of Yusuke Onodera)
- The World of Kiva (native world of King Wataru and Kiva-la)
- The World of Ryuki (native world of Shinji Tatsumi)
- The World of Blade (native world of Kazuma Kendate)
- The World of Faiz (native world of Takumi Ogami)
- The World of Agito (native world of Shouichi Ashikawa)
- The World of Den-O (in the main universe- where the Taros are, and the originating home of the Kamen Riders, neighbors with The World of Shinkenger)
- The World of Kabuto (native world of Souji)
- The World of Hibiki (native world of Master Asumu)
The New Worlds
- The World of Negatives (native world of the Dark Riders)
- The World of Diend (native world of Daiki Kaito)
- The World of Shinkenger (in the main universe- where the Shinkengers and The World of Super Sentai are, neighbors with The World of Den-O)
- The World of Black RX (native world of an alternate (RX) Kotaro Minami)
- The World of Black (native world of an alternate (Black) Kotaro Minami)
- The World of Amazon (native world of an alternate Daisuke Yamamoto)
- The World of X-Rider (origin of Dai-Shocker's Apollo Geist)
- The World of Stronger (S.I.C. Hero Saga Kamen Rider Decade : The World of Stronger)
- The World of the Rider War (the point of connection where the A.R. Worlds would merge, excluding Earth)
Other
- The World of G (native world of Goro)
- Natsumi Hikari's homeworld Rider War (episode)
- The World of Decade (native world of Tsukasa Kadoya, despite having 'no story of his own')
- The World of Televi-Kun (Special Adventure DVD)
- The World of Net (Net Movies)
- The World of alternate Kamen Rider Skull (Movie War 2010)
- The World within the Magic Stone (referred to by Decade as the 'The World of Wizard')
- The World of the Sengoku Period (native world of Bujin Riders)
The Worlds with no relation to Decade
- Magic Land - An alternate world in the Kamen Rider Wizard universe.
- The World of Soccer (or unofficially known as 'The World of Gaim' created by Lapis where the alternate Gaim Riders compete in a Soccer tournament as opposed to Dancing, as well as freed from Inves invasions.)
