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A Perfect Sudoku
From sudokuwiki.org, the puzzle solver's site
|I was asked to find a Sudoku solution - a board with all the numbers placed, which had a very specific property. The person emailing me was intending to make a woodwork piece with nine different types of wood arranged in a Sudoku formation. But to make it work he requested every number on the board should in a different position relative to the 3x3 box each number appears in.
If you look at pretty much any Sudoku solution you will find some numbers that appear twice or more in the same position in a box. I searched through my library of many hundreds of thousands of puzzles and came across just one such puzzle solution. Here it is:
The Perfect Sudoku Solution: Load Example