That would depend on whether the question refers to the painting scraps in the Curious Village or the photo scraps in the Diabolical Box (aka Pandora's Box)
See the appropriate related link for the #1 Google ranked walkthrough
Look down the right side of the walkthrough to find a Scraps index that will show you exactly where to find all of the scraps together with details of what you must have already done before some of the scraps become available
Sorry, Cannot find a Puzzle 255 in Professor Layton and the spectre.
Puzzle No 32: Candy Jars, Enter the Restaurant, Tap the jars on the counter to find this puzzle. Answer = You have 100% average of filling each bag with 25 pieces of Candy.
Puzzle 94, Location: Museum G-Floor
you will find puzzle no.40 at the park gate.hope you find it.
After you find Baron's diary, talk to Dahlia and she'll give you the puzzle.
Puzzle No 129: Block Blockade, Professor Layton and the Unwound Future. Please see the Related link below for a walkthrough of puzzle.
In Puzzle 112 of "Professor Layton and the Last Specter," you need to rotate the puzzle pieces to fit them into the provided outline. To flip the pieces, select a piece and tap the flip button to rotate it 180 degrees. You may need to experiment with different combinations and rotations to find the correct arrangement that fills the entire outline without any gaps. Pay close attention to the shapes and colors to ensure they match the outline correctly.
See the related link for a picture showing exactly where to find this hidden puzzle
Professor Layton and the Curious Village has 135 puzzles, there is no puzzle 150 If another puzzle number was meant or the question refers to puzzle 150 in Professor Layton and the Diabolical Box (aka Pandora's Box), see the appropriate related link below for the #1 Google ranked walkthrough where you'll find all of the solutions including the weekly puzzles
Puzzle No 109, Walking The Dog, Location: West Y-Junction.
Puzzle No 166: Sliding Pipes (US) or Fixing the Pipes (UK) Professor Layton & the Spectre's Call. Please see the related link below.
Puzzle 128: Reverse Rotation. Professor Layton and the Lost Future.Unwound Future. Please see the related link below for a walkthrough of this puzzle.