New brothers, please read the book first. If you encounter something you don't understand, then come back and look at these.

There are also some settings that have not yet appeared in the text, so I haven't posted them yet. I'll slowly add them later.

Nightmare: Contagious, the specific reason is unknown.

Door: 1. For the same group of people, the same door will only appear once. The doors that appear in the protagonist's house are always different, and the worlds behind the doors are also different.

2. A small number of doors, in the long process of evolution, have mutated due to devouring too much of the players' despair and various negative emotions.

1. Clue Newspaper (after each mission, it will appear on the person who leaves the door first).

Function: 1. Helps to review the mission (random, the content varies).

2. If you keep it close to your body, you can actively open the next door in your dreams at night. Nearby players will also be brought into the nightmare. Its function is similar to a key.

3. After entering the mission, if you open the newspaper, some clue information will appear on it. The later you open it, the better and more specific the clues will be.

2. Life-Saving White Paper (can only be obtained when only one person survives in the mission, which is equivalent to fully obtaining the door's recognition).

Function: 1. Blocks one fatal injury in the mission.

2. (The real purpose) is a blank contract. Cutting your palm and pressing a bloody handprint on it is equivalent to reaching a contract with the door, completely obtaining the ability of this door. The price paid is bearing all the curses and despair within the door (the sixth dungeon, Peaceful Apartment, officially appears).

Note: 1. Every time you use the ability, you will suffer backlash from the curses and despair within the door. The higher the frequency of use in a short period of time, the stronger the backlash will be, until you completely lose your mind.

2. The curse cannot be lifted. The only way to alleviate it is to kill other disciples of the door and plunder new doors, but this will also lead to the curse continuing to deepen.

3. Not every door can be obtained.

4. Only mutated doors can give birth to guiyi (bizarre entities), not just ghosts.

Special Note: Mutated doors have absorbed too many players' negative emotions (despair, curses, slaughter, viciousness, etc.) in the long process of evolution, so it is generally difficult for ordinary people to bear. The price of not being able to bear it is to be directly swallowed by despair and become a madman.