Mario - Wikipedia
Koopa Troopa - Super Mario Wiki, the Mario encyclopedia
Sonic - Super Mario Wiki, the Mario encyclopedia
Dr. Eggman - Super Mario Wiki, the Mario encyclopedia
File:Shadowth amy.png - Sonic Retro
Sonic The Hedgehog, PDF, Entertainment
Sonic - Super Mario Wiki, the Mario encyclopedia
Tails - Super Mario Wiki, the Mario encyclopedia
Super Mario 64 Review (Retro) - User Review - The Independent Video Game Community
Silver - Super Mario Wiki, the Mario encyclopedia
Sonic the Hedgehog, MarioWiki
Sonic the Hedgehog (TV series) – Sonic City
Mario & Sonic at the London 2012 Olympic Games - Wikipedia
blackhole part 1
How old are Mario and Luigi supposed to be? - Quora