Bathroom and suitcase
The reported suitcase method aligns the letters so X maps to numbers, removes the X-linked values and uses the remaining digits as the code. See the bathroom suitcase guide.
Coffee windows
Players report that the lit-window clue begins by identifying occupied windows, then using portraits around the house to connect each person to a number. See coffee windows.
Corridor floor
Treat each stain as its own shape puzzle. If the cloth is absent rather than merely unusable, check the missing inventory item fix.
The bathroom note layout remains C · Unconfirmed and appears only in the puzzle index.