Hints:

Beetle symbols
Glowing beetles will appear up to four times during the game. Once 
triggered, Laura will experience some disturbing flashback 
sequences. They are located in varying areas in the game and are 
only accessible after certain specific actions are completed. 

Laura's compact
Select the compact from Laura's inventory to receive a pictorial 
hint to solve the current puzzle. This may only be done three 
times per game. 

Laura's father
At varying locations in the game, Laura's father will speak to her. 

Laura's watch
The game must be completed in two hours (real time). The watch in 
the inventory will keep track of the elapsed game time. The game 
begins at 3:00, and will end at 5:00.