The Invisible Robotnik-Publisher: LadybirdISBN: 0-7214-1739-6Date: 1994"The Invisible Robotnik" with "Awesome fold out picture". Which is hopefully not of invisible Robotnik. Ladybird Books had a whole series of these things. They are short stories, with mostly words on illustrated backgrounds. Info by Ota.Blurb: Sonic the Hedgehog and Ladybird join forced to…