1. First check the big lockbox, enter the next scene and click on the bookcase on the right to check the books to get clues to open the big lockbox and get the phone.
2. Click on the mobile phone to get the "21:30" clue, check the pen on the table to get "left, right, left, left and right", and click the arrow to open the safe in the order to get the needle.
3. Click on the clock and place the minute hand to adjust the time to "21:30" to get a magnifying glass. Check the cup to get the "M-7" clue. Find the corresponding book in the next scene to get the numerical clue.
4. In the first scene, click on the map and follow the numerical clues to get the "5920" password. Click on the schoolbag to enter the password to get the six-pointed star pattern. Complete the game and get the key.
5. Use the key to open the classroom door, enter the dormitory and click on the bed curtain to get the wire to connect to the computer. Click on the card below the countdown to unlock the secret word and obtain the "4218" password.
6. Check the password box on the right and enter it to get the USB flash drive. Plug it into the computer to get the countdown picture. According to the clues, turn the countdown time to 50 days to get the "8250" password.
7. In the next scene, click on the cabinet to get a screwdriver. Take off the postgraduate entrance examination on the door and put it in the gap of the door. Click on the door handle and use the screwdriver to get the key out.
8. Click on the postgraduate entrance examination poster to get the key to open the door. In the next scene, click on the curtain to get clues and piece together the letters to get the "PLRDGE" password.
9. Click on the computer to enter the password to get the emoticon, and get the "246479" password based on the symbols corresponding to the first row of numbers on the computer.
10. Click on the bedside table to get water and a knife. Click on the pillow to get a rag. After watering, you will get a wet rag. In the next scene, use the rag to wipe the blackboard to get a pattern.
11. Use the knife handle to pierce the pattern to get the password box, enter the password to get the key to open the door, and use antidepressant drugs to treat the classmates.