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Duplex Sums Sudoku 

Duplex Sums Sudoku* 

by Henry Kwok** 





This is a clever variation of
Sudoku on a "standard" 9x9 grid which contains a set of
special cluenumbers. These are small numbers always placed on the border lines between selected pairs of
neighboring cells of the grid. Each cluenumber is the
sum of two numbers that should be in the respective pair
of the neighboring cells just next to left and to right
from that cluenumber.
For example, cluenumber 7 on the line between two
neighboring cells means that possible pairs of numbers
for these cells can be from the following combinations:
1 and 6; 2 and 5; 3 and 4; 4 and 3; 5 and 2; or 6 and 1.
The remaining rules are as in a "standard" Sudoku,
and the object of the puzzle is to fill in the whole 9x9
grid with numbers 1 through 9 (one number per cell) so
that each horizontal line, each vertical line, and each of the
nine 3x3 squares (outlined with the bold lines) must
contain all the nine different numbers 1 through 9.
To solve the puzzle you can print just the above grid.
For this click the image of the grid to go to a new
window with this grid; then you can print it. 











Last Updated:
October 14, 2008 







