Annex 5:
-Tilt the top of the device towards yourself to make all the books slide off the shelves.
-Touch the left bookcase and slide out to the right, note which squares contain “X”s, then push the bookcase back and tap the same squares on the door (twice each) to mark them with “X”s
-Similarly, touch the right bookcase and slide out to the left, note which squares contain “O”s, push the bookcase back, and tap the same squares on the door (once each) to mark them with “O”s
See 100 Floor Walkthrough/Solutions to all floors
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