Harry Potter and the Order of the Phoenix

where can u find luna lovegoods thing pls help i'm having trouble with that i found four but not all give me all the places plzz

Hi, I am thinking of writing a walkthrough for this game. It will be ready in a little while. Does anyone have any hints for me? Usefull tips will get you on the credits. So please, anyone?

Where can I find the rest of the talking gargoyles? (I have already found the one in the courtyard)