After completing the first two levels of the game, you should have enough LEGO Pieces for this Easter Egg.
Go into the wizard town through the Leaky Cauldron, the last shop on the left (before the bank). Buy the spell called \'Multicorfors\' (a spell that turns the characters into \"gingers\") and cast it on Ron. He will shake his head as if it has worn off, but his hair will not revert back to its natural color.
Go to the Wiseacres Wizarding Equipment in the Leaky Cauldron hub area (Diagon Alley). Then enter the following code:
ERA9DR - Glacius Spell
Hints & Tips: Easy Money
Find, post and buy the \"Collect Ghost Studs\" extra. The parcel is either in Harry\'s bedroom or on the courtyard fountain (You need the Leviosa spell first). Once activated, the Ghost Studs are worth 1,000 each. \"Get lost\" the ghost will return to you and lay more studs, so a full trip from the Dorm to the Great Hall is worth about 100,000.