Category:A.R. Worlds

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 (9つの世界) 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 (新たな世界) are the A.R. Worlds that are not based on a previous entry of the Kamen Rider Series from the Heisei period.

A.R. Worlds
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.

Nine Worlds

 * World of Kuuga (native world of Yuusuke Onodera)
 * World of Kiva (native world of King Wataru and Kiva-la)
 * World of Ryuki (native world of Shinji Tatsumi)
 * World of Blade (native world of Kazuma Kendate)
 * World of Faiz (native world of Takumi Ogami)
 * World of Agito (native world of Shouichi Ashikawa)
 * World of Den-O (native world of the Tarōs)
 * World of Kabuto (native world of Souji)
 * World of Hibiki (native world of Master Asumu)

New Worlds

 * World of Negatives (native world of the Dark Riders)
 * World of Diend (native world of Daiki Kaito)
 * World of Shinkenger (native world of the Shinkengers and the other Super Sentais)
 * World of Black RX (native world of (RX) Kotaro Minami)
 * World of Black (native world of (Black) Kotaro Minami)
 * World of Amazon (native world of Daisuke Yamamoto)
 * World of X-Rider (origin of Dai-Shocker's Apollo Geist)
 * World of Kamen Rider (origin of most leaders of Dai-Shocker)
 * World of Stronger (S.I.C. Hero Saga Kamen Rider Decade: World of Stronger)
 * World of the Rider War (the point of connection where the A.R. Worlds would merge)

Other

 * World of Decade (native world of Tsukasa Kadoya, despite to have 'no story of his own')
 * World of Televi-Kun (Special Adventure DVD)
 * World of Net (Net Movies)