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Duplex Plex Sudoku*

Number Puzzles

by Henry Kwok**

One more clever variation of Sudoku on a "standard" 9x9 grid. It contains a set of special clue-numbers which are small numbers always placed on the border lines between selected pairs of neighboring cells of the grid. Each clue-number is the product of two numbers that should be in the respective pair of the neighboring cells just next to left and to right from that clue-number.

For example, clue-number 12 on the line between two neighboring cells means that possible pairs of numbers for these cells can be from the following combinations: 2 and 6; 6 and 2; 3 and 4; or 4 and 3.

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.
*) Puzzle concept: Copyright 2006 Henry Kwok. All Rights Reserved.
**) Henry Kwok is the author of this original Sudoku variant. Its name and appearance are the original creations first published here, at my website, AgeOfPuzzles.com.
Last Updated: October 14, 2008
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