KILLER SUDOKU RULES
The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called 'boxes', 'blocks', or 'regions') contains all of the digits from 1 to 9. On the top of each group You can see sum of the group. The group can has the same digits. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.
"Killer sudoku (also killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) is a puzzle that combines elements of sudoku and kakuro. Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic, the hardest ones, however, can take hours to crack.A typical problem is to show killer sudoku, using colors to define the groups of cells. This problem is solved in sites with killer sudoku to play online. More often, puzzles are printed in black and white, with thin dotted lines used to outline the ""cages""
Killer sudoku puzzles were already an established variant of sudoku in Japan by the mid 1990s, where they were known as ""samunamupure."" The name stemmed from a Japanized form of the English words ""sum number place."" Killer sudokus were introduced to most of the English-speaking world by The Times in 2005.
Traditionally, as with regular sudoku puzzles, the grid layout is symmetrical around a diagonal, horizontal or vertical axis, or a quarter or half turn about the centre. This is a matter of aesthetics, though, rather than obligatory: many Japanese puzzle-makers will make small deviations from perfect symmetry for the sake of improving the puzzle. Other puzzle-makers may produce entirely asymmetrical puzzles.
There are many specialized journals and collections, books and instructions for solving them, many newspapers print Sudoku, but at the beginning of the most popular solution to Killer sudoku online."
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