Use the RECORDER on the door (R).
Go through the door.
Take the 2nd RECORD (S).
Take the PIN (T).
Place the 2 RECORDS on the wall to trigger a puzzle (U).
Arrange the records so no two of the same are in a row or column.
See screenshot for solution (V).
Take the SNOWFLAKE KEY.
Go to the Physics Classroom.
Use the SNOWFLAKE KEY on the tank lid. Use the MITTEN to get the BULB WITH NITROGEN (W).
Take the VALVE (X).
Examine the portal and you will automatically place the INSTRUCTIONS on it. Place the VALVE on it and turn the valves as shown; take the LASER (Y).
Go to Larner Hall.