Eggrobo Rush is the second 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 player takes control of Classic Sonic in Sky Sanctuary Act 1, and there are no supporting characters. During this act, many Eggrobos, more than the usual amount, are scattered across the stage, firing their laser guns as the usual. While their numbers don't provide much of a challenge on their own, they can be dangerous due to being able to knock Sonic off of the several vines in the stage that the hedgehog needs to use in order to progress, which can cause him to fall on spikes or into bottomless pits. The player needs to avoid such obstacles and hindrance in order to make it to the goal within the given time limit.