Crate a path that passes through all the blocks just once.
Please look at the screenshot for the solution; go from point A to point B.
Take the SHIELD.
Return to the Grand Hall.
Zoom into the statuette; place the OWL in the slot (C) and take the BIRD PACIFIER (D).
Zoom into the bird and place the BIRD PACIFIER on its head (E). Put the SHIELD in the slot (F).
Go into Cliveâ€™s Chamber.
Read the Book (G).
Take the GARDEN RAKE (H).
Examine the steps and take the CHISEL (I).
Zoom into the bookstand and take the TOOLKIT LATCH (J).
Zoom into the puzzle (K).