This gadget is used frequently to reveal hidden details or progress through puzzles. Puzzles & Hidden Object Scenes (HOS):
The ".rar" file for the Collector's Edition (CE) typically includes several bonus features accessible from the main menu:
Use the map for fast travel between locations.
For a step-by-step text guide with screenshots, the official Big Fish Games Walkthrough covers everything from the Manchester Asylum to the final confrontation.
These are multi-part puzzles. You must complete one section to unlock the next, though you can skip individual parts if needed.