What's the secret of the boiler/technician room in the beginning village?

Question

Do someone know what to do with this room ?

It's in the village from the beginning.

Edit: I found the solution alone, I didn't notice an hidden poster, during a perspective rotation.

Asked by Gimlao

Answer

The code is: ↑ RT ← A → LT ↓ RT

The numbered tetromino posters around the room correspond to the code's order.

E.g., below, #1 is ↑, and #5 is →.

Answered by sean

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