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One Ring Challenge is the first Challenge Act of Chemical Plant Act 2 in the console/PC version of Sonic Generations. It is unlocked after clearing every Stage in the classic era and is playable only as Modern Sonic.
The player is tasked with getting through a certain section of Chemical Plant, with several addition hazards and enemies put in place that aren't usually there in order to make it easier for the player to lose their single Ring. The player must make it to the goal with said ring within a given time limit.