1. Enter the game room, there is a picture on the wall, and the picture is a staff, and the black dots in each note correspond to the line number: 1352.
2. After moving the picture, there is a password box behind it, the password is 1352, and you can get a pliers after opening it.
3. Cut the lock of the box at the bottom of the picture with pliers and get a long hook after opening the box.
4. Pry the middle one under the piano with a long hook to get a key.
5. Use the key to open the cabinet and get wires and matchboxes.
6. Light a candle on the piano with a match and a picture appears with a string of letters on it.
7. Connect the power to the lamp with a wire, and then turn on the lamp to show the number on the paper: 1770.
8. Enter the letter code [BEETHOVEN] and the number code [1770] in the white avatar to open a secret box and get a key.
9. Open the door with the key and pass.