It was known only as the Dungeon, a foreboding structure of stained grey stone built on an island in the center of a large lake. It had, in ages long past, served as a fortress, the last stronghold should the rest of the country fall, now it was a prison. The President for Life had no interest in protest against his rule, had no interest in ever giving up power. Tens of thousands were locked away for no crime other than being in the wrong place at the wrong time, or saying the wrong word. The least lucky of those found themselves in the Dungeon, a place, it was said, that none returned from.
I would like to use a system for this, and am leaning towards the core rulebook of the New World of Darkness just due to its ease, I'm not sure freeform would work, and the only other system I have that fits the setting would be GURPS.
I would be looking for two groups of players, prisoners and guards. The prisoners could be male or female, and political, criminal, or prisoners of war. They would have two simple goals, survival and escape. The guards could be male or female, and would need to be sadists. Their goals would be to prevent escape, and to make life unpleasant for the prisoners.
I would moderate the game, establish/control the setting and environment, and play NPCs as needed.
I am leaning towards Non-consensual Human for this, though could go Extreme if enough players wanted.