How do you find all the raven medals in professor Layton and the spectres call?

first solve the puzzle from louis at the beginning of the market. once you have solved this you will only need to find 2 more. second go and talk to the brother and sister. then go to where aunt taffy is and tap on the umbrella about 10 times. third go and talk to badger in market west. now go to where louis is at the beginning of the market again and at the top right of the screen there should a set of 4 chemneysand tap on them about 10 times and theres the fourth raven medal. now you have all medals go to roddy in market north