MWU - Extraordinary Stairway Escape

Walkthrough:
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-Go to the highest floor
-Click on the left on the wall, it will appear a closet.
-Click on the left door of the closet and take the brush
-Go to 2F floor
-Use the brush on the door and take fire extinguer
-Click on the fire extiguer and then on “about item”
-Click on the yellow thing, and take the key
-Use the key on the other door on the closet
-Take the paper
-Go to the door with the code and imput 144 and you’re out!