The "golden key" is in the scene model room (model display room)

I will briefly summarize this part of the process:

. Enter the Aru Furato's In the official residence, first go to the "Secretary's Office" on the right side of the second floor. There are "Documents" and "Member ID Card" available. Once you have the ID card, go to the first floor and enter your ID (NTC0394). First go to the "Washing Room" on the left. , there is a "briefcase" and a "blood tank", then enter the door above and go east to the "screening room", which contains war stuff! After watching that perverted movie, I found out that アルフレット also has a twin sister... Enter the upper right corner of the screening room, get the "steering wheel", and take down the "golden twin guns" at the bottom of the room. You can't take them away. Had to put it back. Just as I was about to leave, I heard the sirens blaring! Steve drew his gun and refused to put it down! I had to save him...Go to the terminal, the answer is CE

Go to the lobby, take the "steering wheel" to the "Mansion Mooring" to use it, enter the mini submarine, there is a "small "Backpack" (must take it!), walk around after approaching the "shore", and then come to a fork in the road (the above is where you will come after you get the three badges of land, sea and air in the "Airport Control Room"), take the road below and keep moving forward. In front is the "Load Collection Room". Go to 2F and operate the crane to lift the box on 1F to get the "Silver BIO Card"

With the silver BIO card, go back to the training facility 1F and open the door on the upper right. Next A lot of things will happen... Go straight to the "Rally Hall", go up to the second floor, and take the west door! (The orientation is based on the map). There is a room to record, and there is a "hemostatic agent" in it (take it to the savior, and you can get the key pick). Next, you have to fight the monster (you don't have to think about any tactics, just shoot with the bow) OK), after winning, there will be a lot of things (switching to "Golden Pistols" with Steve). Korra and Steve will fall to the east door of "Gara - 1F" and encounter monsters again, but Steve, who loves to show up, will If you don't dare to shoot, take the east door, then go straight north (ignore the elevator for now), go to the "Model Display Room", and get "イ-ゴルプレ-ト" (a very important prop, which can be used on the guillotine or at the assembly venue). When you come out, remember the location of the elevator. 2F goes to the command room, and B1 goes to the "underground ventilation room." If you want to go to these two places in the future, you can go here. But let's go out from the "Chariot Parking Area" on 1F first!

Take both guns to the Secretariat on the 2F of the mansion. Open the door on the upper right with both guns. There is a note inside that says "The first time is left, the second time is left, and the third time is left." It's right, the fourth time is right, right, right." There is a large "オルゴ-ル" (?) in the room. Follow the note and get the four numbers "1971". Turn on the computer and input it. A secret passage will appear, and there will be enemies next. Attack!

Although the secret passage is right in front of you, the life of the benefactor is more important (the key pick is more important! :P). Return to the benefactor with "イ-ゴルプレ-ト" and "Hemostatic Agent" and get "K ey pick", go to the "Guillotine" (where you get the "Fire Extinguisher"), insert the "イ-ゴルプレ-ト", and a secret passage will appear, leading to the "Medical Clinic"

The next step is just to get "ピアノロ-ル", which is the main purpose. Follow the following order: "Defeat the anatomy doctor → get the glass eyeball → install it in the mannequin → go to the room where the chain is tested → draw the sword → push the middle bar counterclockwise → get the ピアノロ-ル!" In addition, don't forget to get the metal on the other side. Take away the temporary props in the detector. Also, there is a briefcase in the "Execution Chamber", and inside it is the "M93R Reinforced Pyrotron", so take it.

With the "key pick", you can open places that cannot be opened, including "2F Security Room" and "B1 Spare Warehouse". Go back and take a look! (You don’t have to take it.) Do you still remember the secret passage opened in "1971"? Going there next! I think many people must embed "イ-ゴルプレ-ト" in front of the stone sculpture of "Assembly Hall 2F". I also tried this method...it will become:

" Acquire the "Essential Artifact Special" → The command room door can be opened → Obtain the "Army Certificate" → The monitor zooms in on the "Painting of Human Bones" → "1126" is learned → The ventilation of the biological laboratory is completed → Use Silver Bio Go to the Biological Ventilation Chamber → Get the "Human Bone Painting" → Go to the Model Showroom on the 1F → Get the "Golden Key" → Go to the Residence 1F → Get the "Queen's Ant Jewelry" → Go to the "Private Residence ホ-ル" → "Silver Get the key → 1F of the public residence → Get the second block "イ-ルプレ-ト" → Get it at the medical center → Get theピアノロ-ル