One Ring Challenge 2

One Ring Challenge 2 is the fifth and final Challenge Act of Rooftop Run Act 1 in the console/PC version of Sonic Generations. It is unlocked after clearing every Stage in the Modern era and is playable only as Classic Sonic.

Overview
This Act takes place within a highly modified version of Rooftop Run Act 1, where there are stone boxes, Spike Traps, and additional enemies placed throughout.

Description
In this Challenge Act, the objective is to reach the Goal Plate at the end of the course while only being given one Ring at the beginning of the Act.

The Act is similar to the normal version of Rooftop Run. The player begins on a section of aqueduct before being launched into the foreground, and then must travel to the left while avoiding enemies and obstacles such as Spikes.