# 18 x Medium Sudoku Puzzles

## Free Medium Difficulty Printable Sudoku Puzzles + Answers

### 5 Approaches for Solving Sudoku Puzzles

Sudoku is one of the most trendy numeral puzzle games right now. This game entails placing in numbers into blank positions. Now, the challenge lies in the restrictions it imposes.

1. To start with, no identical digit from 1 to 9 should be repeated in the horizontal lines.
2. Secondly, no equivalent numbers should be seen in the vertical rows as well.
3. And lastly, none of the 1 to 9 digits must appear in the 3x3 sub-squares of the puzzle.

Since completing sudoku demands logic, then it is but understandable that a number of special techniques have been devised to help in quickly solving sudoku without making any mistakes along the way.

## Popular Techniques for Completing Sudoku Puzzles

### 1. The Simple Solving Techniques

These procedures are generally effective for beginner level sudoku puzzles. Given that the majority of the digits have already been supplied, the sudoku puzzle can then be easily concluded. Some examples of these easy solving sudoku tactics are as follows:

#### The Single Candidate System

Like the name suggests, this requires finding out accurately what figure should go in a specific cell. The most resourceful way to perform this method is to first recognize rows, columns, or sub-squares that have been complete with the most digits already. From there, you can quickly presume valid values to place in the particular unfilled cells.

#### The Single Position Approach

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

### 2. The Medium Solving Approaches

These sets of solving sudoku techniques are your next approach of attack if you are working on more difficult sudoku puzzles. Furthermore, these medium level approaches can be employed as well if your pencil markings have proven to be a little incompetent in placing valid numbers in the different cells.

A number of these methods are detailed below:

#### The Candidate Lines Attack

Much like the single candidate method, performing this approach to help you in completing sudoku puzzles requires checking of the encircling cells.

But instead of merely searching for helpful clues in the immediate cells, you will have to look meticulously at the cells that are situated farther than the cell you are attempting to crack. This way, you get to properly eliminate which number guesses have void placements so that you get to invariably trim down your options.

#### The Multi-Line Approach

This method will usually require you to take a glance at three units of closely located sub-squares so that you get to rapidly spot which lines can be inserted with exacting digits.

#### The Double Pair System

Much like the multi-line approach, this system for speedily solving sudoku puzzles requires you to come up with two number estimates for a cell, after which you use these to try and deduce the possible solutions in the nearest surrounding cells.

### 3. The Superior Methods for Solving Sudoku

If the first few techniques we described above do not aid you in distinguishing suitable number placements, then maybe it’s time for you to use much cleverer systems for completing sudoku puzzles.

#### The Naked Pairs or Triples Approach

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

Now, bear in mind that these pairs or triples can not be inserted 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 further annotated cells thereby aiding you in rapidly and methodically completing sudoku cells.

#### The Hidden Pairs or Triples Procedure

Now, this system is much more hard to utilize when completing sudoku puzzles. This is because instead of seeing straight away figures in pairs or triples, an extra value conceals them, hence the name “hidden”.

### 4. Master Level Approaches

Of course, highly smart techniques for solving sudoku puzzles are available as well. Plus, they have cunning names as well!

#### The X-Wing Approach

This practice demands you to recognize four cells in horizontal columns and/or vertical rows which hold the same number guesses. Once these are spotted, then it’s much simpler for you to rule out specific values in particular cells. Generally, the same figure guesses are positioned such that they shape an invisible letter X, consequently the name.

#### The Forcing Chains Practice

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

### 5. Enormously Hard Solving Process

Much like any other puzzle game that demands cunning as well as logic, this puzzle also has one thoroughly tricky technique for successful solving. This approach is usually utilized if all the other less complicated tactics prove to be inadequate for solving sudoku puzzles.

#### The Nishio Method

This technique for solving sudoku puzzles is pretty much similar to guessing. But to improve the odds of getting the correct solutions, you will need to recognize cells that have only two potential values.

You can then select out one of these values to place in the cell so that you start working your way through the puzzle. However if you get to encounter 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