There must be a puzzle missing, Have a look at the list of puzzles you have already answered and see if there are any numbers missing, when you have found the numbers that are missing, go to Granny Riddleton's Shack and see if the missing puzzles are located there, If they are not there then they are probably hidden puzzles will still be in their original locations.
Missing puzzles on Professor Layton and the Spectre's Call, You would need to click onto the cat who will then show you the puzzles you are looking for.
To get the weekly puzzles on professor layton, goto bonuses, then weekly puzzle, then download puzzles and then click ok. After that goto solve puzzles and your weekly puzzles should be there.
If you look through the list pf puzzles carefully you will find which of the puzzles you have not answered, the reason you may not have answered them is because they are probably hidden puzzles that are still be in their original locations. Please see the Related link below for the frequently asked questions page which will give you a little more information.
Professor Layton and the Diabolical Box. To open the Puzzle Master's House..You must have solved 138/138 puzzles plus the four other houses, Look through your puzzle index to see if you have any numbers missing, if there are numbers missing, check to see if the unsolved puzzles are in Granny Riddleton's shack. Please see the Related link below for a walkthrough of what happens when you have completed 150 puzzles.
In Professor Layton's Pandora's Box, there are 33 Weekly puzzles.
You will need to look at how many puzzles you have completed, you would have to have missed at least one puzzle in order for you to be missing some of the Gizmo's.
Puzzle 54, Painting The Flag, Location: Wheat Fields. Answer =The Flag designs that would be possible is 36
Professor Layton and the Weekly puzzles. Please see the Related link below for a walkthrough of weekly puzzles.
Your question is not very clear and one can only guess that your are talking about . You could be talking about the Strange Gizmos for the puzzle at the Inventor's house to obtain the bonus puzzles. If you mean where do you find all the painting scraps to put the puzzle together for the Art Lover's House bonus puzzles. I don't think you are talking about the different furniture you need to put in Luke's and Professor Layton's rooms at the Decorator's House, but I guess you could be asking about the furniture. In any case I have added a link below the answer in the related questions to Puzzle number 5 which lists most of the locations for the different puzzle pieces needed to complete the bonus puzzles.
Professor Layton and the Diabolical Box Answers to all the puzzles. See the related link below for a walkthrough of all the puzzles.
If you could send the Professor Layton and Pandora's Box puzzle number and perhaps the title also we would then be able to help you solve the problem, otherwise, take a look in your puzzle index to see if there are any numbers missing-if there are take a walk to Granny Riddleton's shack to see if there are any puzzles there for you to solve. There are 138 puzzles to be found and solved plus the five houses in Professor Layton's challenges making 153 puzzles in total.
Puzzles for the Castle. Professor Layton. Please see the Related link below for a walkthrough.