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From Sonic Retro
(This is the American story contained in the manual of Sonic Spinball (8-bit).)
The twisted Dr. Robotnik is back! And this time he's hatched an evil plan to transform all the creatures of Mobius into robots. To do this, Robotnik's deisnged the Volcano Veg-O-Fortress, a super-efficient robot factory hidden inside an island volcano.
Robotnik's harnessed the molten lava of the volcano to power the Veg-O-Fortress. He's already captured thousands of animals in his fiery fortress. And he's created a diabolical pinball security system to secure their imprisonment. It's up to Sonic — the world's coolest hedgehog — to free his friends and stop Robotnik's sinster scheme, before it's too late!
Full Manual
Scans of the manual are below: