Rooftop Rail Grind

Rooftop Rail Grind is a Challenge Act that appears in the console/PC versions of Sonic Generations.

Description
The player takes control of Modern Sonic in Rooftop Run, and there are no supporting characters.

The player is given a board throughout the whole stage, and they simply need to make it to the goal in the given time limit. The stage is also slightly altered with ramps and springs in order to make the level's layout more friendly towards board riding.