unit 33
begin
size 9
problem
2 4 - 5 - - 9 - 3
- - 3 - 2 - 6 - 8
1 6 - - - - - 5 -
- - - 6 1 9 - - 5
- 2 - 7 - 5 - 8 -
9 - - 4 8 2 - - -
- 9 - - - - - 3 6
5 - 6 - 4 - 8 - -
8 - 2 - - 6 - 9 4
solution
2 4 1 5 6 8 9 7 3
7 5 3 9 2 4 6 1 8
1 6 4 8 9 3 7 5 2
3 8 7 6 1 9 2 4 5
6 2 9 7 3 5 4 8 1
9 1 5 4 8 2 3 6 7
4 9 8 2 7 1 5 3 6
5 3 6 1 4 7 8 2 9
8 7 2 3 5 6 1 9 4
areas
a b b b b b c c c
a a a a b c c c c
a a a a b b b d c
e e e f f d d d c
e e f f f f f d d
g e e e f f d d d
g e h h h i i i i
g g g g h i i i i
g g g h h h h h i
end
Irregular sudoku 8 (Sudoku Jigsaw, Kikagaku Nanpure) is a number puzzle. Translated from Japanese, “su” means “number”, and “dock” means “standing separately”.
In a Irregular sudoku puzzle, the grid is a 9x9 square divided into smaller squares with a side of 3 cells (“regions”). Thus, the entire field has 81 cells. Some of them already have numbers (from 1 to 9). Depending on how many cells are already filled, the puzzle task can be attributed to easy or difficult.
Irregular sudoku puzzles have only one rule. It is necessary to fill in the free cells so that in each row, in each column and in each small 3x3 square, each digit from 1 to 9 would occur only once.