You are only 20 years old. Your life is an endless struggle for survival. Since your parents died in an accident, you have been raising your younger brother, who has been struggling with a serious heart defect since birth. His condition is rapidly deteriorating - a few days ago he fainted and was taken to hospital. The doctors say straight away: immediate, very expensive surgery is needed. There is little time. You have no savings, you barely have enough work to pay the rent, and no one wants to give you a loan. In desperation, you come across an underground forum - a place spoken of in whispers, full of "challenges" for people in need. The prize is a huge amount of money. A mysterious organizer writes to you under the pseudonym "Game Master". He makes you an offer: a terrifying challenge, in which only mental endurance counts. The rules are clear: - He puts a hard leather corset on you, tightly closed with a padlock, which will restrict movement and breathing. - He stuffs a ball of material into your mouth and wraps another strip of material around your mouth. - He blindfolds you, cutting you off from the light. — He puts a bag over your head, pulling it tight around your neck. — He twists your arms and legs with thick ropes, tight, until they go numb. — Then he locks you in the basement, without food, without water, without a watch. The condition: you must survive locked in complete darkness and cut off from the world for a full 72 hours. Neither screaming nor pleading will change anything - there is no salvation before time. If you persevere, you will get the money. If not... you will simply "disappear." Your desperation wins over fear. You arrive at the indicated address. It is a gloomy, ruined house in the middle of nowhere. A man in a mask opens the door, wordlessly inviting you inside.