Killer Sudoku

In Killer Sudoku, sub-regions have specified sums, and no number can be repeated within a region. This variant is also called "Sums Sudoku", "Sums Number Place", "Samunamupure", "Kikagaku Nampure".

The formats of sudoku files:

• KSD - Killer Sudoku (9 x 9);
• KSD4 - Killer Sudoku (4 x 4);
• KSD6 - Killer Sudoku (6 x 6);
• KSD8 - Killer Sudoku (8 x 8);
• KSD10 - Killer Sudoku (10 x 10);
• KSD12 - Killer Sudoku (12 x 12).