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.
This Challenge Act takes place in a modified version of Sky Sanctuary Act 1, where the player must navigate through the course filled with Eggrobos.
The player takes control of Classic Sonic in Sky Sanctuary Act 1. During this act, many Eggrobos (more than the regular amount) are scattered across the stage, firing their laser weapons as usual. While their numbers do not provide much of a challenge on their own, they can be dangerous due to being able to knock Sonic off several of the 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 hindrances in order to make it to the goal within the given time limit.