Outside:
Shake the plant in front of the door. A key will fall out. Pick up the KEY and use it on the front door. Enter the school. The door locks behind you.
Hall:
The lower right corner of the rug holds a key. Pick up the KEY. Walk all the way north. Take the PICTURE from the wall. Enter the toilets on the lower right.
Toilets:
Look in the bin. There’s a KNIFE. Pick it up. Use the knife on the picture and find another KEY. Use the key to unlock the door of the Biology Classroom, on the upper left side.
Biology:
Enter the room. Take the piece of PAPER from the teachers desk. Read the paper telling you that Jan had some spare keys and hid them around the school. Open the cupboard and take the BRICK with you. Leave the room and go to the maths room.
Maths:
There’s something hidden under the desk on the right. It’s a pair of SCISSORS. Take them. Look at the blackboard and the message there. Use the brick on the window and go through them.
Garden:
Pick up the brick again. Talk to the janitor. It’s Jan! You can have the chalk and the rake but need to do something in return. For the chalk it will be the strip of leather, for the rake it will be the snail. Use the brick on the other window. Climb through and enter the janitors’s closet.
Janitor’s Closet:
Use the key on the cupboard. After it opens you find a leather APRON. Take it. Use the scissors on the apron to take a leather strip. Go outside again.
Garden:
Give the strip of leather to Jan. You receive the CHALK. Enter the Maths class again.
Maths:
Use the chalk on the blackboard. A niche will open and has a KEY in it. You automatically take it out. Leave the classroom and go back to the biology classroom, upper left. Use the grey key to enter the room.
Biology:
Open the cabinet and use the key on the box. Once opened you see the SNAIL. Take it and leave the classroom again, back to maths class. Climb through the window and talk to Jan again.
Garden:
Give the snail to Jan. You’ll get the RAKE. Use the rake on the leaves at the right. There was another KEY underneath. Use the key on the main gate to go home.
Game source: A copy of the game was found here on the internet.