Board Thread:Sonic News and Updates/@comment-24108393-20131118164338/@comment-679780-20131209000144

It is canon but regarded as spin-off from the major Sonic games.

In Sonic Generations Sonic compares the strange colourless time periods as no different than rescuing genies in magic books.

But the Storybook series are based on actual legends, such as One Thousand and One Nights and Historia Brittonum.