Return to the room and enter the door. We will come to a classroom. Directly clicking on the trash on the table will clean up the trash directly. Get the broom equipment in the upper right corner and you can sweep the garbage on the floor. After all the garbage is cleared, the door will open. After leaving, enter another door. Just equip the blade and interact with the teacher on the podium. (If you don't take the blade, the protagonist will refuse to come forward) (This is the content of level 4)
Go back to the room and step out the door. You will arrive at a space where you can only see the puzzle content of this level by equipping yourself with the glasses in your backpack. Just click on all the hearts in the map once, and hearing the prompt sound means that this level has been resolved. (This is the final level of content