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.

1 Answer

There is a code embedded in the posters on the wall.

Boiler room

Spoiler:

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

E.g., above, #1 is ↑ and #5 is →.

The code is:

↑ RT ← A → LT ↓ RT

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