Why Sonic the Hedgehog is Blue - and Why It's Robotnik's Fault?

Sonic the Hedgehog in Castle Robotnik (Literature) - TV Tropes

The problem with . . . Sonic The Hedgehog.

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The Best Things About Jim Carrey In Sonic The Hedgehog

How It Should Have Ended' Hilariously Picks Apart 'Sonic 2

Sonic 2 review: Has same problems as first film

Dr. Robotnik's Mean Bean Machine and Sonic the Hedgehog 2 to be added in Nintendo's online expansion pass - Tails' Channel

Sonic the Hedgehog 2's Biggest Easter Egg and Other References - IGN

something I've been wondering about sonic's lore. What is Dr Robotnik's (or eggman's if you prefer) motivation for being the villain of the series? : r/SonicTheHedgehog