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I have finished the game and I have the map of all the floors at 100%, except the one that I show you in the image:
I don't know how to enter in that room. The button next to it is a trap (simply by using it something hits you, it does nothing else). I have also tried using other levers on the same floor, but nothing works. There are also no holes in an upper floor that allow me to throw myself there. Does anyone know how to enter??