G'morning Earl, 

 ET> Do you have a sample puzzle and its solution?  I'm not sure I
 ET> understand the rules.

Sure do:  the rules read "Fill the grid so that every column, 
every row and every 3x3 box contains the digits 1 to 9".

Take the example starter:-

 MM>5 0 0  7 0 8  0 0 3
 MM>0 0 2  9 3 0  0 0 0
 MM>0 0 7  0 6 0  4 1 0

 MM>6 0 0  3 0 9  0 5 1
 MM>0 1 5  0 0 0  9 2 0
 MM>2 7 0  1 0 4  0 0 8

 MM>0 4 6  0 1 0  5 0 0
 MM>0 0 0  0 9 6  3 0 0
 MM>0 0 0  4 0 2  0 0 0

...and when solved it becomes...

5 9 1  7 4 8  2 6 3
4 6 2  9 3 1  8 7 5
8 3 7  2 6 5  4 1 9

6 8 4  3 2 9  7 5 1
3 1 5  6 8 7  9 2 4
2 7 9  1 5 4  6 3 8

7 4 6  8 1 3  5 9 2
1 2 8  5 9 6  3 4 7
9 5 3  4 7 2  1 8 6 

Its a narrow-minded exercise in elimination of possibilities, I 
find - and its palls after one has done 5 or 6...

Apparently,  its a big hit in the British newspaper market;  its 
been running here for about a month - with no indication of how 
popular its is proving.

:-)

(EVE/DID = .TALKTALK.... has 2 solutions !)
 
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