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Anway, if you run round the outside you'll come across the corridor but you can't exit it. In the corridor are 4 paintings, 2 on each side, you put the crystals in the wall under the paintings and this unlocks the door in the basement.
Once done, go down to the basement and the door is on the inside of the circular track, took me a while to find it but it is there.
ELJUICY - I did not steal your name, I have had this nickname for years.
If you haven't got all four then the door wont open.
Don't forget that there are two doors down in the basement.
Welcome to the forums as well.
:)
Oh, and to answer your question, check out www.gamefaqs.com
or
check out www.ukwalkthroughs.com although i wouldn't expect there to be an in-depth walkthrough, as there is no reward for posting walkthroughs anymore.