What is the minimum amount of clues you could start off with in Sudoku?

sudoku
larmo68 asked:

Most of the ‘hard’ Sudoku puzzles I do have 22-24 clues to start off with. Are there some with fewer clues? I’m looking for a real challenge. What is the minimum amount of clues that still lead to a solvable puzzle?



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2 Responses to 'What is the minimum amount of clues you could start off with in Sudoku?'

  1. verschuren - September 3rd, 2008 at 12:00 pm

    17. Link has a collection of puzzles with just 17 clues.

  2. mityaj - September 6th, 2008 at 8:45 am

    This is actually still unknown and some mathematicians are trying to figure it out. The smalest number of clues that lead to unique solution is 17, but nobody proved that you can not do it with less. There is a puzzle with 16 clues that has 2 solutions.
    There are sudoku books that have very challenging puzzles. It is not always the number of clues that determines the difficulty.


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