Friday, December 23, 2011


Rules :

1) Rules of Classic sudoku apply.
2) Place digits 1-9 in each row, each column and each 3*3 region.
3) If the absolute difference between two digits in neighbouring 
    cells is 1, then a white dot is indicated.
4) If the digit in a cell is half of the digit in a neighbouring cell, then 
    black dot is indicated.
5) Remember if neighbouring cells are 1 and 2, then they can have 
    either of the dots black or white. 

Example :  This example is taken from SUDOKU CUP 2009

Solution : 

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