Sonic the Hedgehog yearbooks: 1991 & 1994

Book

Sonic the Hedgehog in Robotnik's Labratory

Book

Sonic the Hedgehog in Castle Robotnik

Book

Sonic the Hedgehog And The Silicon Warriors

Book

Sonic the Hedgehog In The Fourth Dimension

Book

Sonic the Hedgehog: Robotnik's Oil

Book

Sonic the Hedgehog: The invisible Robotnik

Book

Sonic his amazing history

Book

Welcome to the world of Sonic

Book

Sonic the Hedgehog tales of deception & tales of terror

Book

Sonic X books

Book

The History of Sonic the Hedgehog

Book

Sonic the Hedgehog (with another faked-up "origin story")

Book

Sonic the Hedgehog 2 the secret admirer

Book