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*The Beginning*
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The game begins with Harry and Dudley stuck in a tunnel with two. Dementors. 
To get rid of them you need to cast three Patronus Charms. To do this wiggle 
the right analogue stick from side to side and Expecto Patronum will be cast. 

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*12 Grimauld Place*
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After the cut scene you are now beside Sirius at 12 Grimauld Place. Your 
first task here is to help Ginny push all the furniture against one wall of 
this room. To do this you must first teach Ginny how to cast Accio and 
Depulso. After Sirius’s demonstration of Accio you must cast it one three 
items of furniture then Ginny will copy the spell too. When you have done that 
you must do the same with Depulso. When she has learnt both spells you may 
then use them to move the furniture against the far wall. 

With Ginny’s task finished it is now time to help Hermione. For this task you 
need to learn how to cast Reparo. As with Ginny, watch Sirius then copy the 
spell and repair three piles of plates. When Hermione has also cast the spell 
you must then repair the rest of the furniture around the room. 

To help Ron you need to learn Wingardium Leviosa. Once more, watch Sirius and 
cast Wingardium Leviosa on three items of clothing in front of the trunk. When 
Ron has put the fourth one in you only need to move the ones off the bed into 
the trunk and you are finished at Grimauld Place. Enjoy the cut scene.