The fighting room :

The fighting room is an empty room, with only chains and handcuffs hanging from a wall, the curious masochists will handcuff themselves to see what will happen to them.
Once they are handcuffed, another door opens, nothing happens immediately, but soon people come through this door.
There are men, sadists, and even some entities. They have baseball bats, iron bars, chains, brass knuckles… or simply bare hands.
They are going to beat the masochist without any mercy during 12 hours, then the neon lights go off and they go away during 12 hours, and come back to start again.
For a long time we thought that the loop was infinite with no hope of escape, but over time some "lucky" maso's have completed the conditions.
Every single bone must be broken at the end of the 12 hours, If even the bone of a little finger is intact, or if a bone was broken a few hours earlier but has had time to regenerate, the handcuffs remain locked.
It can take years or even decades for this condition to be achieved by chance, but sometimes a nice sadist decides to proceed metodically to free a masochist and go play other games with her.