This code is very useful, but has bad side-effects. First, you must find Ginny so you can go to Diagon ALley. Then, go through the way you came in and enter again. At the loading screen, you'll see a picture of the Burrow. But, when you start playing again, you'll be standing in Gryffindor Common Room! The nasty side-effects happen after you help Ron with the slugs. When Harry, Hermione, and Ron are talking, they'll start having the conversation that is supposed to happen after you finish fighting the Whomping Willow!