Aerial Paradise is the third Challenge Act of Sky Sanctuary Act 1 in the console/PC version of Sonic Generations. It is unlocked after clearing every Stage in the classic era and is playable only as Classic Sonic.
The Challenge Act takes place in a highly modified version of Sky Sanctuary Act 1, seemingly at nighttime. During this Act, a number of Warp Points are placed throughout the stage, which are needed to be used in order to progress through and complete the Act.
The player begins partway through the Act, and will shortly come across a Warp Point. Several walls and platforms have been moved around throughout the stage, so the player must use the Warp Points to travel through the barriers and progress through the Act.