From Sonic Retro
|level, Sonic X-treme
|Number of Acts: 3
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Galaxy Fortress, also known as Death Egg was a level planned for the unreleased Sonic the Hedgehog game, Sonic X-treme, taking place in outer space on the edge of Dr. Eggman's latest and greatest creation.
There were intended to be at least three acts, which would have been named "Factory Robo," "Proving Grounds" and "Megabase Control."