Like the game series the Silent Hill movie features three layers of reality. Here are the different levels of Silent Hill explained.
Sharon Da Silva, Silent Hill Wiki
Silent Hill 3, Silent Hill Wiki
Silent Hill Movie Production - Silent Hill Memories
Silent Hill (film) - Wikipedia
Ghosts of The Silent Hills by Anita Krishan
Silent Hill 2 Remake: World Exclusive Deep Dive Interview - IGN
Silent Hill 3 - Internet Movie Firearms Database - Guns in Movies, TV and Video Games
SILENT HILL (2006) Explained
The Ending Of Silent Hill Explained
Do You Not Know We Will Judge the Angels?”: A 15 Year Retrospective on Silent Hill (2006) – A Huffle of Horror
Horror Reboot 'Return To Silent Hill' Casts Its Two Lead Actors
Silent Hill HD Collection - Xbox 360, Xbox 360
Pyramid Head - Wikipedia
Silent Hill: How the Movies Compare to the Games