Here is a puzzle with the given digits
{1,2,3} in block 1, block 6 and block 8,
{4,5,6} in block 2, block 4 and block 9 and
{7,8,9} in block 3, block 5, and block 7
in a way that each row and each column contain three digits as
well.
I found a lot of them. Does anyone know if there is a collection of
such puzzles somewhere?
Example(difficult one):
Code: Select all
1 . . | 4 . . | 7 . .
. 2 . | . 5 . | . 8 .
. . 3 | . . 6 | . . 9
---------------------
6 . . | 8 . . | 3 . .
. 5 . | . 7 . | . 1 .
. . 4 | . . 9 | . . 2
---------------------
9 . . | 2 . . | 5 . .
. 8 . | . 1 . | . 6 .
. . 7 | . . 3 | . . 4
Christoph