Board Thread:Off Topic/@comment-1478058-20150314002647/@comment-3503787-20150828091352

Most of them are pretty self-contained, but some are connected to the others.

W, Fourze, and OOO are connected (and like I said, the Holy Trinity of Kamen Rider)

Agito is set in an alternate universe after Kuuga, or something.

Decade is a giant crossover mess.

Most of the movies/crossover specials are non-canon, too.