After the lecture you’ll be handed a book with a blueprint in it. It’s from before the renovation.
TAKE BOOK and GO NORTH into your office. There’s a blueprint on the wall from after the renovation so if you COMPARE BLUEPRINT WITH BOOK you’ll see the hidden room north of the west wing. GO SOUTH to return to the lecture hall and GO SOUTH again to the northern museum floor.
GO SOUTH once more to the southern museum floor and GO SOUTH a final time to find the entrance. TALK TO LINA several times until she brings up Jeffrey’s toolbox. So it must be around here somewhere.
GO WEST to the personnel room. From here you can GO NORTH into the janitor’s office. It’s small. EXAMINE CALENDAR to notice the birthdays. There’s one without a name on next Thursday. So if today is Friday 13th, next Thursday must be the 19th. GO SOUTH to leave the room and GO WEST to the passcode door. Now what could be the code? ENTER 1902 INTO NUMPAD and the door will unlock. You’ll be in the storage room where you’ll find three shelves.
If you EXAMINE SHELF2 you’ll notice a crowbar on it. TAKE CROWBAR and when you EXAMINE ROOM you’ll see the bookcase with a draft coming from behind it. When you MOVE BOOKCASE you’ll find the crack on the wall.
BREAK WALL WITH CROWBAR to open the crack but not far enough. You need another tool.The trick os now to find Jeffrey’s toolbox. It will appear in a random location after 6 o’clock. So retrace your steps to previous rooms and EXAMINE ROOM. Once you’ve found the toolbox, EXAMINE TOOLBOX to see the hammer. TAKE HAMMER and return to this room. BREAK WALL WITH HAMMER and you’ll end up in a puzzle room with two puzzles.
EXAMINE PUZZLE 1 to see the rotation pieces and get an understanding of what needs to be done. EXAMINE ROTATION PIECE 1 to get a description of the piece. You’re probably need to figure out what picture the four pieces should make but I don’t get any description with rotation pieces 2 to 4. Nevertheless, if you ROTATE P1R1 and repeat the command until you hear the piece click. (It says it’s non-rotatable now but you can repeat the command 😉 Do the same with ROTATE P1R2 and ROTATE P1R3 and ROTATE P1R4 until the trinity knot is restored.
EXAMINE PUZZLE 2 and repeat the process until you reveal an exit to the east. GO EAST into the labyrinth. If you want to explore, make a map. Conveniently the rooms are numbered. The way through the labyrinth: GO EAST to room A3. GO EAST again to room B3. GO NORTH to room B2. GO EAST to room C2 (note: from here you can’t get back to B2). GO SOUTH to room C3. From here GO EAST to where the labyrinth opens up. GO EAST a final time to discover the forgotten room. You’ve reached your goal.