Lair of the Time Eater

The Lair of the Time Eater is a hidden location exist in the White Space in Sonic Generations. It is the gears that repair time and space of Sonic's world and the hidden entrance to the Time Eater dimension.

Overview
The Lair of the Time Eater is composed of variety of gears that is seen floating without aid in the air, each one with smaller platforms that reach the player to another gear. In the far end of the Lair is the portal of the Time Eater which is closed and cannot be opened until the Chaos Emeralds have been collected. While it is never said how the Chaos Emeralds are related to those gears, but they are the only way to to activate the portal and fix the space.

In the story, the lair can be visited after clearing the Egg Dragoon boss battle, however the time gears cannot be activated until all the Chaos Emeralds put in them. Every gear in the lair must be activated by one Emerald to make it work and spin with their rising platforms (Any Chaos Emerald can be put and not in order). When all the Chaos Emeralds have been successfully put, the big portal of the Eater's dimension will rotate and their torches begin to take the flame underneath the Portal. When all the flames have been burned, the portal will open and the Chaos Emeralds will return to Sonic, allowing the user to go to the Final Battle.

After completing the game, the time gears will stay be activated and the player has not have to care for activating the gears once again.