3
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I know that 17 is the minimum for a standard 9x9 (3x3 squares), but what about a 16x16 (4x4 squares) sudoku?

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    $\begingroup$ When you say 3x3 and 4x4, do you mean 9x9 (standard) and 16x16 (what's in the title)? $\endgroup$ – Rand al'Thor Sep 12 at 16:32
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    $\begingroup$ Of possible interest is Wikipedia's "Mathematics of Sudoku" section Sudokus of other sizes. $\endgroup$ – Weather Vane Sep 12 at 19:50
  • $\begingroup$ The answer is here: forum.enjoysudoku.com/… $\endgroup$ – Duck Sep 12 at 22:14

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