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1sudoku.com Sudoku Killer - Hard - n° H3680
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Play hard sudoku killer 9x9 online for free
Discover here free sudoku killer grids to play online, they are divided into 4 difficulty levels: easy, medium, difficult and expert so that each player (beginner, regular or pro) will find his fun. Access is free and unlimited, and all of our online sudoku puzzles are single-solution.
How do I play sudoku killer online?
Glossary of game options:
Clear the contents of the box
Undo the last move
Redo last move
Automatic selection of boxes on hover (on computer)
Show all possible candidates on the grid
Show / Hide solution
Sudoku Killer Rules:
The goal is to fill the grid, so that each row, each column and each region of 3x3 boxes contains all the numbers from 1 to 9.
The number at the top of the first box of each dotted region corresponds to the sum of the digits of the boxes of that region.
For example a region of two cases with the number 5 can be broken down into 1+4 or 2+3.