Write down the number you see on top of the record player - with the corresponding shapes.
There are 3 shapes: triangle, diamond and inverted triangle.
Now go to that building close to the entrance.
See a set of numbers and a switch at right of it.
- select a shape using the switch.
- write down the number that are on that panel (let's call this panel A).
- turn right and see another panel. Press the red button and the numbers changed.
- these are the numbers that the panel A numbers get converted to.
Let's say (example only) you selected diamond shape on the switch and get numbers 1 2 3 4 5 6 on panel A.
Then you turn right and press button on this panel B and get a new set of numbers: 6 5 4 3 2 1.
This means: diamond 1 is now diamond 6, diamond 2 is now diamond 5 and so on...
Do this for the inverted triangle and upright triangle.
Now - work on the numbers seen on top of the record player.
You will see those diamond numbers or triangle numbers or inverted triangle numbers.
Convert those numbers now to the new ones you saw on panel B.