Getting more cards
When you have been to the storeroom and collected the 200 berties beans bag and the 6 cards that are in there, go back to Fred and George (at night) and buy the Alohamora spell book for 80 beans. You can them use this spell to open all the locked chests that are scattered around the castle. Also, collect more beans and go back to Fred and George and buy all of their cards. They are nearly all 30 beans each (I think)
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