I just joined today specifically to ask this question. I never get wrapped up in games but I've been stuck on year 3 "pursuing pettigrew" for days now. The section where there are many corridors and two prefects. I've tried a bunch of the paintings but they're no help. I always always get caught. Are there more hints than what I've found on here which mostly consists of "follow a prefect to the statue"? That's easier typed than done.