# 24 x Hard Sudoku Puzzles

## Free Hard Difficulty Printable Sudoku Puzzles and Answers

### Five Techniques for Completing Sudoku Puzzles

Sudoku is one of the most trendy numeral puzzle games right at this moment. This puzzle game entails putting in figures into blank slots. Now, the challenge lies in the limitations it imposes.

1. Firstly, no equal number from 1 to 9 should be repeated in the horizontal lines
2. Secondly, no equivalent numbers should appear within the vertical rows as well
3. Finally, none of the 1 to 9 digits should be seen in the 3x3 sub-squares of the puzzle

Because solving sudoku demands logic, then it is but understandable that a number of separate procedures have been created to assist in rapidly solving sudoku without making any blunders along the way.

## The 5 Most Popular Techniques for Solving Sudoku Puzzles

### 1. The Simple Solving Methods

These strategies are commonly useful for beginner level sudoku puzzles. Since the majority of the digits have already been filled in, the sudoku puzzle can then be easily concluded.

Some examples of these simple solving sudoku methods are as follows:

#### The Single Candidate Technique

Much like the strategy’s name suggests, this entails finding out accurately which number should go in a specific cell. The most resourceful way to carry out this system is to initially identify rows, columns, or sub-squares that have been complete with the most numbers already. From there, you can quickly reason suitable values to consign in the particular unfilled cells.

#### The Single Position Tactic

This technique will entail you to inspect rows, columns, or sub-squares that are previously partly filled. This way, you get to identify precisely what numbers go in which vacant cells.

### 2. The Intermediate Solving Methods

These models of completing sudoku tactics are your next approach of attack if you are working on more tricky sudoku puzzles.

Furthermore, these intermediate level procedures can be employed as well if your pencil markings have proven to be a little ineffective in placing suitable numbers in the various cells.

A number of these are detailed below:

#### The Candidate Lines Attack

A lot like the single candidate technique, performing this tactic to assist you in solving sudoku puzzles requires checking of the surrounding cells.

But instead of merely searching for helpful clues in the immediate cells, you will have to look thoroughly at the cells that are situated farther than the cell you are trying to solve. This way, you get to properly eliminate which value guesses have invalid placements so that you get to invariably cut down your selections.

#### The Multi-Line Strategy

This system will usually require you to take a look at three sets of closely situated sub-squares so that you get to rapidly spot which lines can be placed with exacting digits.

#### The Double Pair Method

Much similar to the multi-line strategy, this method for quickly completing sudoku puzzles needs you to come up with two number approximates for a cell, after which you use these to try and reason the possible solutions in the adjoining surrounding cells.

### 3. The Advanced Strategies for Solving Sudoku puzzles

If the first few methods we described above do not help you in distinguishing applicable number placements, then maybe it’s time for you to utilize much cleverer tactics for completing sudoku puzzles.

#### The Naked Pairs or Triples Strategy

Grab your pencil and begin expanding upon unfilled boxes of the possible values. Now, the key here is to look for detailed number guesses that appear in exact identical combinations in other cells. Usually, these numeral estimates are either in two’s or in three’s.

Tke into account that these pairs or triples can not be placed in any other cells except the ones they have been annotated in. Because of this, you can then swiftly eradicate these pairs or triples from other annotated cells thus aiding you in swiftly and systematically solving sudoku cells.

#### The Hidden Pairs or Triples Method

Now, this method is a great deal more hard to utilize when completing sudoku. This is for the reason that instead of seeing straight away numbers in pairs or triples, an extra number conceals them, consequently the name “hidden”.

### 4. Sudoku Master Level Methods

Of course, extremely brainy methods for completing sudoku puzzles are available as well. In addition, they have crafty names as well!

#### The X-Wing Attack Method

This system demands you to recognize 4 cells in horizontal columns and/or vertical rows which contain the same number approximates. After these are spotted, then it’s a great deal easier for you to rule out specific values in particular cells.

Generally, the same figure estimates are positioned such that they create an invisible letter X, consequently the name.

#### The Forcing Chains Method

This approach primary starts out with you identifying cells that have a pair each of the same figure guesses. Choosing only cells with candidate pairs is crucial as putting one or the other of the values inevitably “forces” the unused value into the other empty cell thus solving the puzzle more quickly.

### 5. Particularly Challenging Solving System

Much like any other puzzle game that needs cunning as well as logic, this puzzle game also has one thoroughly tricky method for successful solving. This process is usually utilized if all the other less complex techniques prove to be inadequate for completing sudoku puzzles.

#### Unusual Practice of Solving Sudoku Puzzles - Nishio Method

This system for solving sudoku puzzles is pretty much akin to guessing. But to improve the chances of getting the correct answers, you will need to spot cells that have only 2 likely values.

You can then pick out 1 of these values to place in the cell so that you may start working your way through the puzzle. But if you get to encounter some repetitions, then you will inevitably need to go back to the original guess you put in.

#### New Free to Print Sudoku Puzzles

We have uploaded several new printable sudoku puzzles for you to enjoy. You can locate the new puzzles by clicking the following link.

#### Free Online Tetris Game

Play the classic puzzle rotatation game Tetris. See if you can beat the highest score! Play Free Tetris

#### Free Maths Game

Random numerical questions, try and correctly solve the sums as swiftly as possible. Free Maths Game

#### Printable Evil Sudoku Puzzles

###### Sudoku Techniques and Tips

The appeal of Sudoku lies in the broad difficulty the game can present, from simple to annoying, which allows users of all skill levels to play at an suitable level. Sudoku also offers a wide choice of procedures that can be used to complete puzzles, from straightforward to complex.

And that's where the real appeal of the game can be found, as every board can be solved through nothing but logical deductions. There is no guesswork or trial and error necessary, though these are often employed tactics as well.

Sudoku Techniques and Tips