Finally! Fans can roam Hogwarts!
"Order of the Phoenix" starts off with a quick montage of the "Dementor" scene from the movie. Then, it gives you a quick, overview of the controls at Sirius' mother's house. After that, your free to roam Hogwarts until your hearts content. Or until you finish helping out your classmates.
The "challenges" are not hard at all. Even the chess games are elementary! :) So, don't buy this game because of the challenges and activities that await you... play it for the thrill of walking around Hogwarts! :D