. "0"^^ . . "Sonic the Hedgehog: The Invisible Robotnik"@en . "Sonic the Hedgehog: The Invisible Robotnik is a picture book published in 1994 in the UK by Ladybird Books. It was released alongside Sonic the Hedgehog: Robotnik's Oil, and both feature fold-out centre pages. The story takes place in Sonic the Hedgehog 2's Hill Top Zone."@en . "Sonic the Hedgehog: The Invisible Robotnik is a picture book published in 1994 in the UK by Ladybird Books. It was released alongside Sonic the Hedgehog: Robotnik's Oil, and both feature fold-out centre pages. The story takes place in Sonic the Hedgehog 2's Hill Top Zone."@en . . . . . . "1994"^^ . . "Hardback"@en . "Sonic the Hedgehog: The Invisible Robotnik"@en .