# 12 x Hard Sudoku Puzzles

## Free Hard Difficulty Printable Sudoku Puzzles and Answers

### 5 Tactics for Solving Sudoku Puzzles

Sudoku is one of the most well-liked numeral puzzle games right now. This puzzle game entails placing in figures into blank positions. Now, the difficulty lies in the restrictions it imposes.

1. Firstly, no equal number from 1 to 9 must be repeated in the horizontal columns
2. Secondly, no same numbers should be seen within the vertical rows as well
3. Lastly, none of the 1 to 9 numbers must be seen in the 3x3 sub-squares of the puzzle

Because solving sudoku puzzles requires logic, then it is but understandable that a number of special strategies have been devised to help in rapidly completing sudoku without making any blunders along the way.

## The 5 Most Common Techniques for Solving Sudoku Puzzles

### 1. The Easy Solving Approaches

These methods are generally useful for beginner level sudoku puzzles. Given that the majority of the numbers have already been supplied, the sudoku puzzle can then be effortlessly concluded.

Some examples of these easy solving sudoku procedures are as follows:

#### The Single Candidate Technique

Like the name suggests, this entails finding out accurately which figure should fill a particular cell. The most capable way to carry out this technique is to firstly recognize rows, columns, or sub-squares that have been supplied with the most digits already. From there, you can quickly reason suitable values to place in the particular empty cells.

#### The Single Position Tactic

This procedure will entail you to inspect rows, columns, or sub-squares that are previously partly filled. This way, you get to locate exactly which numbers go in which empty cells.

### 2. The Medium Solving Strategies

These models of completing sudoku strategies are your next line of approach if you are working on more difficult sudoku puzzles. In addition, these medium level strategies can be employed as well if your pencil markings have proven to be a little ineffective in putting suitable numbers in the various cells.

A number of these are detailed below:

#### The Candidate Lines Approach

A great deal like the single candidate technique, performing this tactic to help you in solving sudoku puzzles needs checking of the surrounding cells.

But instead of merely looking for helpful clues in the immediate cells, you will need to look thoroughly at the cells that are situated farther than the cell you are attempting to crack.

This way, you get to correctly eliminate which value guesses have invalid placements so that you get to invariably trim down your options.

#### The Multi-Line Strategy

This technique will normally require you to take a glance at three units of closely situated sub-squares so that you get to swiftly spot which lines can be inserted with exacting digits.

#### The Double Pair Method

Much akin to the multi-line tactic, this technique for speedily completing sudoku puzzles needs you to come up with 2 number estimates for a cell, after which you use these to attempt and reason the potential solutions in the adjoining surrounding cells.

### 3. The Complex Strategies for Solving Sudoku

If the first few strategies we described above do not aid you in identifying suitable number placements, then perhaps it’s time for you to employ much cleverer methods for completing sudoku puzzles.

#### The Naked Pairs or Triples Strategy

Grab your pencil and start annotating unfilled boxes of the possible values. Now, the key here is to look for precise number estimates that appear in precise same combinations in other cells. Typically, these numeral estimates are either in two’s or in three’s.

Bear in mind that these pairs or triples may not be inserted in any other cells apart from 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 methodically completing sudoku cells.

#### The Concealed Pairs or Triples Method

Now, this technique is a great deal more hard to make use of when completing sudoku puzzles. This is for the reason that instead of seeing straight away numbers in pairs or triples, an extra number obscures them, hence the name “hidden”.

### 4. Master Level Tactics

Of course, highly clever strategies for solving sudoku are available as well. Plus, they have crafty names as well!

#### The X-Wing Approach

This procedure requires you to notice four cells in horizontal columns and/or vertical rows which contain the same number guesses.

When these are spotted, then it’s a good deal less difficult for you to rule out particular values in particular cells. Generally, the same figure approximates are positioned such that they shape an invisible letter X, hence the name.

#### The Forcing Chains Technique

This approach first starts out with you identifying cells that contain a pair each of the same figure estimates. Choosing only cells with candidate pairs is important as putting one or the other of the values inevitably “forces” the unused value into the other unfilled cell by this means solving the puzzle more rapidly.

### 5. Extremely Hard Solving Technique

Much like any other game that needs cunning and logic, this puzzle also has one really tricky technique for successful solving. This system is normally utilized if all the other less complicated techniques prove to be inadequate for completing sudoku puzzles.

#### Alternative Method For Completing Hard Sudoku Puzzles - Nishio

This system for completing sudoku is pretty much akin to guessing. But to improve the chances of getting the right solutions, you will need to spot cells that have only two probable values.

You can then pick out 1 of these values to put in the cell so that you get to start working your way through the puzzle.

But if you get to come across some repetitions, then you will inevitably need to go back to the first 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