Lower the aquarium and reach the Library
Use the recovered crank at the Foyer mechanism to lower the aquarium and open the Lobby route. Clear the Lobby encounter, then continue to the Library. Flying books block your approach, so keep moving between throws and use the shelves as cover when lining up the next doorway. Your target is the Poltergeist, not an ordinary Hider concealed in a cupboard.
Reach the Kitchen from the Dining Room
In the Dining Room, pull the cord to use the small lift down to the Kitchen. Catch the armed Greenies by waiting until they expose their faces to attack; a Strobulb flash aimed at their covering will not stun them. The Dining Room’s ceiling safe opens with the Strobulb. For the Kitchen gem, open the fridge, turn on the stove and hold the gem’s ice block in the flame until it melts. Return along the available route to the Library.
Defeat the Poltergeist
Watch for the Poltergeist between book throws. One flash removes its book protection; follow with another flash when its face is exposed, then vacuum it and pull against its escape. Keep away from the remaining flying books while reeling it in. Additional Poltergeists join the encounter, so repeat the stun-and-capture sequence until the Library is clear. On a later replay with Dark-Light, reveal the missing easel in the Studio for Boo Boo. The gem in the Entrance is also worth taking during A-3: dislodge the right armor’s helmet and shoot it at the high painting on the opposite wall.
Collectible checklist
Gloomy Manor gems — #5 Entrance, #6 Dining Room, #7 Kitchen
Boo checklist — Studio: Return after A-4, pull the cloth and restore the missing easel beside the camera.