Return to the room again and enter the door. You will come to a grassland where there will be a red monster. Every time you interact, he will go to a new place. Just play hide and seek with him and find him. After finding him a certain number of times, there will be a sound prompt and new items will appear in the backpack (this is the content of level 3) (note that if he has a blade in his hand, he will refuse to interact with you)
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