LEGO Harry Potter: Years 1-4

After the Leaky Cauldron hub area is unlocked, enter Wiseacres Wizarding Supplies in Diagon Alley before starting actual game play. Go upstairs and talk to the vendor, then enter one of the following passwords to activate the corresponding cheat function.

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To destroy objects with red sparkles around them, you must use Dark Magic. In order to use dark magic you need to use the Polyjuice Potion or use an evil character (for example, Lord Voldemort, Tom Riddle or Barty Crouch Jr.) in Freeplay mode. An evil characters' Wingardium Leviosa spell is changed to the Crucio Curse and can destroy the red sparkling objects.

Enter the following codes in Wiseacres Wizarding Supplies upstairs

Enter the codes in Wiseacres Wizarding Supplies

Successfully complete the first two levels then enter the wizard town through the Leaky Cauldron. Enter the last shop on the left (before the bank). Purchase the "Multicorfors" spell. Cast it on Ron Weasley. Although he shakes his head as if the spell has worn off, his hair will remain red.