# Hard Sudoku

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 Highlight: Touch Manual Pencil Marks

 Similar Puzzles Level # Stats Play
 Hard 1455563 Hard 1276981 Hard 1228019 Evil 1903186 Hard 1140170 Hard 1341356 Evil 1664806 Medium 796719

## Sudoku hard

This level of difficulty demands concentration and patience. You need to have some tools in your belt to solve this one and actually enjoy while doing so. What an inexperienced player would think is brain busting impossible sudoku, You might consider a good bone stretch.

Either way, let us run you through some tips and tricks.

## How to solve hard sudoku - sudoku tricks

What makes hard sudoku is the scarcity of the originally given numbers, which makes you need to use pencil marks, go through the numbers in your head and use your memory.

Still, there are patterns that you can utilize that are powerful solving techniques we are sure you would appreciate.

## Sudoku X-wing

look for 4 cells with the possible same digit that create the shape of an X. See image below: Go to the x-wing tutorial

## Sudoku swordfish

The same principle of the x-wing method only this time isolate 3 columns with the same possible digit. See image below: Go to the swordfish tutorial

## The LiveSudoku game features

If you are a frequent user here you probably know the great ease in which the game is set in our sudoku kingdom.

For you the new visitor, a great feature we have is called highlight digit, which highlights the digit you want across the whole grid, making it very eye-friendly to spot that eluding empty cell.

For the advanced sudoku games, you can use the pencil mark which lets you type in more than one optional digit in a specific cell, allowing you to narrow down all the optional numbers.

There is also an undo button which is so useful. You can check yourself at any time with the check solution button.
You can press the options button and tweak your preferences of some colors and our help level. So start playing web sudoku easy level and have fun!

## About live sudoku

Live-Sudoku was created in 2006 and is one of the original websudoku sites. The creator of the website Mr. Izenberg built it with the same love he has for the game. LiveSudoku is home to all Sudoku players around the world from easy and medium sudokus to hard and evil sudoku levels.

You can invite a fellow Sudokuer for a match of speed and concentration. Sign in to track your statistics, see your best and worst games and compete in the arena of sudoku enthusiasts. Enjoy your game!

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Keys

 Arrow keys Move the cursor around the Sudoku grid 1-9 Fill digit in cell Tab Move to the right Shift + Tab Move to the left Backspace Clear cell Spacebar Clear cell Delete Clear cell Ctrl + Z Undo move X Clear all digits from the Sudoku grid C Check solution Ctrl + S Save game ALT + 1-9 Highlight Digit The following keys require that "Allow pencil marks" is enabled from the options menu: V Clear all pencil marks 1-9 When digit already present in cell - make the digit a pencil mark 1-9 When digit is a pencil mark - remove the pencil mark 0 or H or Enter Fill pencil marks automatically

Clear all numbers from the grid?

Clear pencil marks from all cells?

Game Options

 General Options Highlight and Colors Check Solution Style

 Allow Pencil Marks[?] On     Off Show the Keypad On     Off Show Timer On     Off

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Clear all numbers from the grid?

Or start a new random Sudoku:

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