You haven't solved all 132 puzzles
The game tells you (both in the trunk and in the save slot) how many puzzles you've both found and solved
Players who think they've solved all 132 puzzles usually just look in the game's puzzle list, see that the last puzzle there is 132 and mistakenly assume that they must have solved all 132 puzzles
The puzzle list only shows those puzzles that have already been found, not every puzzle
Unless the found/solved count shows 132/132, then the last puzzle house will not open
If the game says, for example, that you've only solved 131 puzzles, then you have to very carefully look through the list to find the missing puzzle number ... if you don't find it, look again (some players have had to look through the list multiple times before spotting it)
Once you have the missing puzzle number, check this walkthrough to quickly find where the puzzle is (if it's not in Granny's shack)
http://professorlaytonwalkthrough.blogspot.com/
There's a puzzle index down the right side of the walkthrough you can click on
On a side note, this walkthrough can also be used for more puzzle solving fun, by looking at those puzzles that are specific to the other version (US/UK) of the game (there's over 180 puzzles between the versions)
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