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Prison Hall is the fourth stage of Sonic Forces and the second to be played with the Avatar. The stage is located in Death Egg Zone from Sonic & Knuckles, which has been restored and transformed into a space prison for the resisters captured by Eggman Empire.
In terms of plot, in a flashback in the City, Infinite attacks some resisters, eliminating all of them except the Avatar, who with fear tries to attack him without success. Returning to the present, Rouge is revealed to be the spy commanded by Knuckles and then informs to other members of the Resistance that Sonic is trapped for months in a space prison in Death Egg, which to the surprise and awe of all, has been rebuilt.