The Mystery Room Steam

This game is a game where you solve the puzzle problem and escape the room.
When you start the game, you will be able to solve the puzzle problem and ask for reasoning ability.

The protagonist entered the house to experience horror and was trapped in the room.
Every time you escape from a locked room, the story is revealed a little bit.
Play the game and find out what secrets are in the house where the protagonist is trapped.

Find hints scattered around the room (paper, items, etc.).
Use your hints to unlock the puzzle to figure out your password.
The goal of the game is to unlock the vault, obtain the key, and escape the room.
There is no timeout for the game, no additional hints.
Think slowly, think again and solve the problem.