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Hard

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1sudoku.com Sudoku Killer - Hard - n° H31016

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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
Visual aid
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.