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Almost Naked Sudoku (Posted on 2009-02-12) Difficulty: 3 of 5
A Sudoku with NO numbers provided whatsoever? Devious and/or fiendishly clever? One solution from millions? Yes!

The rules here are really very simple!
It's a basic Sudoku with 1 to 9 appearing in every row, column and each of the nine blocks, although not diagonally (no large 'X'). All numbers that are higher than their abutting non-diagonal cell neighbours in the same block are in the pink cells. All numbers that are lower than their abutting (non-diagonal) cell neighbours in each block are in the blue cells. (The colour relationships do not apply between adjacent blocks!!)

That's it! Definitely enough to get any self-respecting hard-core Sudoku fanatic started with a combination of some logical thinking and standard Sudoku techniques.

Note: Graphic is a "jpg", xhtml generated by brianjn.

See The Solution Submitted by rod hines    
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Hints/Tips assuming | Comment 1 of 3
I'm assuming that each 1 must be on a blue square and that each 9 must be on a pink cell. From that I can deduce the locations of all the 9's and 7 of the 1's.
  Posted by Charlie on 2009-02-12 18:28:53
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