Thats not true... 2 of the 6 worlds are Silent Hill locations (even if you're not physically going there it's Walter's dream world I know), the town is explicitly said to neighbor Silent Hill which goes along with the Toluca fog rule and the story is directly related to 1/3. Walter is unwittingly trying to rebirth the god thinking he's bringing his mom back by doing a ritual Dahlia tricked him to do. The events of 4 cannot happen without being in proximity to the town. And that's just ignoring the fact that the series' core is "American horror as interpretted by Japanese people"Silent hill 4 is the only one where the town is a back-drop, but something to consider is that the team never wanted it to be silent hill 4.
Like its not an anthology of people with grief to overcome across the world, it's the story of the spiritual energy that is localized to a single lake with silent hill.
Silent Hill 4 may not have started development as a Silent Hill but it became one and was given every consideration to make sure that made sense. Its not like it was 90% done then they slapped Silent Hill onto it. This bit of trivia was just an early developement fact.
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