Harry Potter and the Chamber of Secrets Walkthrough
Diagon Alley: Magical Menagerie

Quest #2. The Magical Menagerie is run by a cranky old wizard. Just run in to the inner door, but then you have to be sneaky. Go right in to the center aisle and watch where the old wizard goes. Go around the other side and hit the button. Don't worry if he catches you, you just go back in again. Once the button is in, it stays in. Now go around to the door the same way - in to the center then dodging where he's looking. In the next room is Ginny's brass scales and a card - Tilly Toke. That's it!

Harry Potter and the Chamber of Secrets Walkthrough, Tips and Techniques