# 12 x Medium Sudoku Puzzles

## Free Medium Difficulty Printable Sudoku Puzzles + Answers

### Five Techniques for Completing Sudoku Puzzles

Sudoku is one of the most popular number puzzle games right now. This game entails putting in figures into blank positions. Now, the challenge lies in the restrictions it imposes.

• To start with, no same digit from 1 to 9 must be repeated within the horizontal lines
• Secondly, no identical numbers should appear within the vertical rows as well
• Finally, none of the 1 to 9 numbers should appear in the 3x3 sub-squares of the sudoku puzzle

Because completing sudoku puzzles demands logic, then it is but understandable that a number of different approaches have been created to assist in speedily completing sudoku puzzles without making any mistakes along the way.

## Five of The Most Accepted Procedures for Completing Sudoku Puzzles

### 1. The Easy Solving Approaches

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

#### The Single Candidate System

Like the name suggests, this requires finding out accurately what figure should go in a particular cell. The most efficient way to carry out this practice is to first recognize rows, columns, or sub-squares that have been complete with the most digits already. From there, you may quickly presume suitable values to place in the particular empty cells.

#### The Single Position Approach

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

### 2. The Medium Solving Approaches

These sets of completing sudoku strategies are your next method of approach if you are working on more tricky sudoku puzzles.

In addition, these medium level approaches can be utilized as well if your pencil markings have proven to be a little inefficient in putting valid numbers in the various cells.

A number of these are detailed below:

#### The Candidate Lines Attack

A lot like the single candidate method, performing this approach to assist you in solving sudoku puzzles requires checking of the encircling cells.

But instead of solely looking for helpful clues in the immediate cells, you will have to look carefully at the cells that are situated farther than the cell you are attempting to complete.

This way, you get to accurately eliminate which number guesses have invalid placements so that you get to invariably cut down your choices.

#### The Multi-Line Strategy

This technique will typically require you to take a look at 3 sets of closely located sub-squares so that you get to swiftly spot which lines can be inserted with exacting numbers.

#### The Double Pair System

Much akin to the multi-line approach, this system 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 deduce the probable solutions in the adjacent surrounding cells.

### 3. The Advanced Methods for Completing Sudoku puzzles

If the first few strategies we described above do not help you in distinguishing valid number placements, then perhaps it’s time for you to utilize much cleverer methods for solving sudoku puzzles.

#### The Naked Pairs or Triples Strategy

Get your pencil and begin expanding upon empty boxes of the probable values. Now, the secret here is to look for detailed number estimates that appear in exact same combinations in other cells. Usually, these number estimates are either in two’s or in three’s.

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

#### The Hidden Pairs or Triples Method

Now, this procedure is much more complex to utilize when solving sudoku puzzles. This is since instead of seeing straight away figures in pairs or triples, an added number hides them, consequently the name “hidden”.

### 4. Master Level Tactics

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

#### The X-Wing Attack

This procedure requires you to see 4 cells in horizontal columns and/or vertical rows which hold the same number approximates. When these are spotted, then it’s a good deal less difficult for you to rule out particular values in particular cells.

Normally, the same figure approximates are positioned such that they shape an invisible letter X, hence the name.

#### The Forcing Chains System

This method first starts out with you identifying cells which have a pair each of the same value guesses. Selecting only cells with candidate pairs is vital as putting one or the other of the values inevitably “forces” the unused number into the other vacant cell by this means completing the sudoku puzzle more rapidly.

### 5. Extremely Hard Solving Technique

Much like any other puzzle game that needs cunning and logic, this puzzle also has one really tricky method for successful solving. This approach is usually employed if all the other less complicated methods prove to be insufficient for solving sudoku puzzles.

#### Unusual Technique - Nishio

This technique for solving sudoku is pretty much like guessing. But to increase the probability of getting the right answers, you will need to recognize cells that have only two likely values.

You can then pick out 1 of these values to put in the cell so that you 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 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