Mt. Mobius

The Veg-O-Fortress, Robotnik's base on Mount Mobius seen in the opening to Sonic Spinball

Mount Mobius is asserted to be the highest mountain in Sonic's world. This behemoth of rock and vertigo dosn't need a continental shelf to bulk up its altitude; the mountain is a single, titanic volcano, rising up out of the sea and being generally intimidating to nearby observers. As the Veg-O-Fortress, it is the setting for Sonic Spinball - and at the end of the game, the mountain sinks beneath the waves.

Veg-O-Fortress

What exactly Mt. Mobius looked like in its pristine, natural state is not something we ever get to know, for the mountain makes its first appearence only after it has attracted the attentions of Doctor Robotnik. In the style of evil geniuses everywhere, the good Doctor decides that the planet's loftiest peak would provide an excellent site for another of his evil bases; and the locale is all the more attractive by the fact that Mount Mobius' furious volcanism will provide ample electricity for his deranged schemes.

Thus, by the time Sonic and Tails arrive, the towering spire of rock has been roboticized into the Veg-O-Fortress. This industrialised leviathan includes four distinct levels:

• Toxic Caves (Toxic Pools in some versions): Sonic is flushed into a stinky cavern full of toxic sludge and mine carts, which just so happens to be the place where Robotnik dumps all of the industrial waste.
• Lava Powerhouse: Sonic ascends to the next level, a power station of sorts that uses magma and steam energy to run various machines.
• The Machine: At the industrial heart of the Veg-O-Fortress lies an immense, automated badnik production plant, complete with mass-roboticizer and a central prison for those animal friends yet to be 'processed'.
• The Showdown: A launch pad at the summit of the mountain, where Robotnik attempts to escape aboard his spaceship.

Destruction

After pretty much everything inside the Veg-O-Fortress gets wrecked during the events of Sonic Spinball, Robotnik's artificial facility collapses. The end sequence of the game shows Mt. Mobius and the remnants of the Veg-O-Fortress falling beneath the waves. Consequently, the mountain is destroyed, and the title of Mobius' highest peak goes... elsewhere?

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