Here are some hints that are not directly related to finding the hidden pages.

Silent Hill Test

Quizzes of your Silent Hill love. The standard version consists of 10 questions and the advanced version consists of 20 questions.
You can answer the quiz as it is, answer it while researching, or answer it with playing the main game. How many points can you get?

Answer (Standard)
QuestionAnswer
1The place of the silent spirits
2Neck
3Walter Sullivan
4Little Baroness
5Prison
6Rosewater Park
7Paleville District
8craving
9Success of the mining industry
10Yes
Answer (Advanced)
QuestionAnswer
1Dr. Atkinson
28am - 5pm
3A. Conroy
4Dowsing
560 acres
6OUT OF THIS WORLD
7Mexican
8Huey the Horse
9$15
10St. Stella Church
11A Candle
122
13Edward Chester
14Allen Smith
15Mining
161862
171916
18A woman in blue overalls and a red shirt
191810
20Pleasant River

By the way, according to the director’s staff blog (posted on November 23, 2021), there is a super hard version that you can try when you visit the museum…

D4-mail

Soon after you see the message from RAY, you receive an email from Ruby. Let’s follow her instructions. Don’t have the code on the tourist guide? Try searching for X, reddit, etc.
But be careful, this could lead to you getting involved in an incident.

Threatening incidentApproximately one day after the initial interaction, you receive a threatening email from someone calling themself unknown, followed by several related emails.
It’s up to you what you do after reading those emails.
Message from RubyAbout a day later, you receive an email from Ruby.
I guess it’s okay to trust her, right?
Get involved in an incidentOne day later, the incident is discovered and your and Ruby’s lives are threatened. To protect yourself, you must find Felix’s login information and delete your data as soon as possible.
Login information

You can find out the ID rule and and password’s hint from information provided by Ruby.
ID is “First name + Last Initial + Year the person joined the museum”, and password is what he desires. Therefore, Felix’s login information is as follows:

IDPassword
FelixC2017Ruby
Ending

Two days after successfully deleting the address, you receive a video message from Ruby, who seems to have somehow survived, and that’s the ending.

Now, Ruby sent you the code, right…?

Accusations of a man who risked his life

When you piece together the seven hidden messages (24~30/36), you get the following:

Accusation

If something goes down, I stashed the message on this site.
I’m the only one who could pull that off.
Isabel Smith’s my aunt.
She was always all smiles.
She got caught up in that unsolved serial murder in this town and passed away when I was 12.
I’m so sorry she left her little daughter behind.
That’s why I thought I should try to solve this case myself.
One day, completely by chance, I stumbled upon something unexpected. I found a person using an alias.
He’s the one who saved my life.
I started searching for the reason he was using an alias.
Then some facts started to come together.
All I had was a bad feeling.
I was speechless by the hypothesis I came up with.
This person must be the true culprit in the case.
I’m trying to solve.
In the near future, I gotta hit him with my conclusion.
I can’t even imagine what I’ll find out.

Given his age, it is believed that Felix Crain wrote the accusation. (If you don’t know who he is, continue exploring the website.)
Who is the person in question?