Prototype Centrifuge Zone

Sprites and background taken from www.themysticalforestzone.com.

Credit for backgrounds goes to Shadowbot, Zero the Hedgehog, Apocalypse the Hedgehog, Skylights, Domenico, Heavy Metagal, Supachao, Snowflake, and HMS aka Metallix.
Credit for Sonic Sprites goes to Cylent Nite.
Credit for Motobugs goes to Skylights and Gold Sonic.
Credit for Rhinotank goes to Skylights.
Credit for Egg Eagle goes to Skylights.
Credit for Leon goes to mechachu.
Credit for Buzzer goes to mechachu.

The Centrifuge connects to many points in anyone's past. In this case, it's Sonic's past. There is one more place, but I can't find any locations that would look like the Center of Time from Generations.