Spoiler:

You have to convince 4 people (I don't remember their names): The scottish girl near the payphone, the american who thinks he is a film maker (and is having a fight with a girl), the shy bloke sitting on the bench, and the rich girl who is lying in the sun. The 2 other people are a) yourself and b) a guy, Malik, who doesn't need convincing, he's gonna be there anyway.

Spoiler:

If I remenber welll, take the camera in Helena´s room

Spoiler:

finished talking with the police detective on the phone about something unusual which happened back then in the 2002 accident

Spoiler:

Have you looked at the photos on the desk in the office? For a second time? Especially at the one with the blue tiles in the background? If not, you have to take that photo (it show the couple drinking at some kind of party), scan it and find something noteworthy...

Spoiler:

word generator machine

Spoiler:

- Are you supposed to do anything with the filter or something to get a sample from the water?
- Angela wanted to be alone after she gave me a paper fairy.
- I've gotten into all the rooms and gotten a camera from Ms. Erotic herself, but I still can't figure out what I'm supposed to do at the library. All Sam does is search for David Styles and she won't talk to the librarian, nor take paper.
- I saw Laura in the house, talked to Dr. Styles... No idea what to do next in the house.
- I've bugged the phone of that horrible guy that hates Dr. Styles.

Spoiler:

-You only have to visit the library in chpater 4 to ask some info regarding the "daedalus" game.

-After Angela gives you the paper fairy, there isn't anything left to do with her. No worries there.

-You don't have to do anything with the filters or the water, other than simply looking at them.

Spoiler:

Have you understood what your goal is? You have to dig up some dirt on the other students. Plus, you also have to set up a trap to catch the "prankster" who dyed the pool red, according to Sam.

So, have you checked out the students? You have to gain access to their rooms. Specifically the two guys' rooms (The American's and the shy bloke's, sorry, can't remember their names...). You have already talked to Angela, you have talked with the sex-bomb (the name thing again...), and you've found out that Malik works for the professor who hates Dr. Styles.

Now, regarding the traps... You have to set up some kind of trap in the Gym. You can find the stuff you need in Mephistpheles' store, after you check out the gym itself.

Spoiler:

Anyway, you DON'T have to hide somewhere in the gym, simply set up the traps. Since you have 100% in that area, you are good to go!

Once again, forget about the library. It only has to do with the C Railer Swoll "quest", which is the next "step" in the daedalus challenge. From what I've understood, you haven't done anything regarding this, so, no bonuses. Go and talk to Mephistopheles, if you want to complete C Railer Swoll.

Are you sure you have checked thoroughly EVERY room? In the shy bloke's room, you have to take a photo and his mom's phone number. Beware: You have to use your mobile phone on the number to add it to your contacts. In the American's room, you have to check out the script.

After all that, return to the sex-bomb's room. Talk to her about all the others.

Spoiler:

talked to Dr. Styles completely, the house is now gray and I have seen the rooms and trash talked with Sex Bomb...

Spoiler:

I was stuck at that point for a long time yesterday till I saw the 5-letter answer on page 1 of this thread. But how did you guys get to that solution? Where is the clue?

Spoiler:

The one who sold his soul for thirty (dinars), aka Judas. The answer was also suggested by the tour guide in the Cathedral, if you took time to talk to him thoroughly.