Trial Setting: A sealed, abandoned senior-year classroom, forever dim and without light, with no difference between day and night.
Trial Participants: 12 ordinary people who wandered in at random.
Basic Public Rules (known to everyone from the start):
1. The trial lasts ten days. After ten days, everyone is reset and made to start over.
2. The classroom is always safe. Step more than ten meters outside it, and you will vanish in an instant.
3. At midnight every day, one "rule-breaker" will be eliminated at random.
4. All the rules are announced only once, and will never be supplemented.
The Hidden Core Paradox (the key to clearing the trial): No one knows what counts as breaking a rule.
Everyone is trapped in an endless cycle of suspicion and infighting. With the rules unknown, they live in constant fear, testing, killing, and betraying one another. Yet no one realizes that the real violation is hidden in the most insignificant details of everyday life.
