User blog comment:Pikatwig/Sonic Timeline Theory/@comment-4916454-20120312232304

Including the Sonic underground timeline is just as ridiculous as including Mobius and the spin-offs. Sonic doesn't live on mobius, he primarily lives on Earth which has been confirmed by one of the japanese classic game manuals. Sonic never had a family or siblings, and I'm pretty sure Classic Sonic is 10 while Modern is 15. As for the spin-offs, they don't count as being in a timeline, like Triple Trouble, or Tails Adventure, or the Sonic Rider's series. Only the main console series is part of the timeline.