Welcome to the Sudoku Instructions Program – probably the best Sudoku program you will ever come across
• The Sudoku program you dream about
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Learn to solve any Sudoku
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User-friendly – extremely easy to use – both in English and Danish
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Interactive – helps you along
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Everybody can use the program – even kids, who will learn a lot
Sudoku is one of the most popular puzzle games of all time. The goal of Sudoku is to fill a 9×9 grid with numbers so that each row, column, and 3×3 box contain all of the digits between 1 and 9.
At the start, some spaces have given digits. Your task is to fill the empty spaces with the correct digits.
Sudoku is a fun puzzle game once you get the hang of it. At the same time, learning to play Sudoku can be a bit intimidating for beginners.
Consequently, I have made this very user-friendly sudoku program for you. It has a wealth of features helping you to become an expert in the game.
- You can use it with any version of Windows
- You can solve any Sudoku
- You can enter Sudokus from newspapers etc.
- You can make Sudokus (beginner to extremely difficult)
- You can save Sudokus on your computer
- You can save partially solved Sudokus
- You can get Sudoku tips at any stage
- You can see all possible digits in every square (the ‘candidate table’)
- You can see a log of the whole solving process
- You can reduce the number of possible digits in every square (‘candidate reduction’)
- You can let the computer solve any Sudoku immediately
- You can go back one step at any stage
- You can print Sudokus easily
- You can get extensive help from the built-in help file
- The program has been painstakingly tested to secure optimal performance
- The program is guaranteed free of any virus or malware
- You can easily shift between the English and Danish languages in the program
All these features can help and assist you in your sudoku solving.
Now you can get Sudoku Instructions at a special very low price of only $9.99 USD
You will also receive a FREE Course In Sudoku when you buy the program.
You have an unlimited money-back guarantee; so if you are not satisfied, you can have your money back no questions asked.
If you have any questions about the program, you are welcome to contact me.
The Sudoku Instructions Program features in more detail
- Well-designed sudoku board. You can easily identify each column, row, and 3 x 3 box.
- Enter sudoku easily. You can enter any Sudoku puzzle from newspapers, magazines, and books.
- Make sudoku of 8 grades of difficulty from beginner to extremely difficult.
- Get hints during solving. The program can help you at any stage during the game.
- Print sudokus. You can print any number of different sudokus using the program.
- You can save any Sudoku puzzle and later load and solve it when you wish.
- You can also save a partially solved Sudoku puzzle and later reload and continue solving.
- Solve any sudoku – even the most difficult.
- Display or hide the possible digits in each square (the ‘candidate table’) at any stage.
- Placing digits is easy: Click a square and a digit in a pop-up window or a candidate digit if it is shown.
- Go back one or more steps if you have made a mistake.
- Find single candidates (squares where only one digit can be placed).
- Show methods to remove candidate digits (candidate reduction) to disclose single candidates.
- The program will explain all methods in a simple and understandable way.
- Remove candidate digits ‘manually’. You may like this if you are a Sudoku expert.
- Let the program perform a maximum candidate reduction. This is a very powerful feature.
- Use tie-breaker and Ariadne’s thread to solve even the most difficult sudoku puzzle.
- Make a computer solution in 0.1 seconds.
- Get comments on each step in the solution process.
- Get a complete description of the solving process to copy to your word processor.
- Record the time to solve a given Sudoku puzzle with the built-in clock.
- Use advanced methods with the program.
- Shift easily between the English and Danish languages in the program
Sudoku Board of the Sudoku Instructions Program
The columns are named columns A, B, C, D, E, F, G, H, and I.
The rows are named rows 1, 2, 3, 4, 5, 6, 7, 8, and 9.
Each square is identified by its column and row, e.g. B7.
The nine boxes of 3 x 3 squares are named boxes J, K, L, M, N, O, P, Q, and R. These letters are used to avoid confusion with the column letters. The box names are shown as large capital letters in light gray in the box background.
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Enter a Sudoku into the Sudoku Instructions Program
Using the Sudoku Instructions Program you can easily enter Sudoku puzzles from newspapers, magazines, and books with built-in testing for errors.
Here is a sudoku puzzle from a newspaper:
To enter this sudoku into the Sudoku Instructions Program you click the menu item “File” and then “Enter Sudoku Puzzle”
Then this window will appear:
Here you just enter the digits in the right squares using the keyboard.
In the picture below the sudoku puzzle has been entered completely:
When you click Finished, the puzzle will be transferred to the playing board, see the picture below.
Now you are ready to play!
Good luck!
Before you play, you may want to save the sudoku puzzle onto your computer. You can do that by clicking the menu item “File” and then “Save Sudoku Puzzle To File”.
Make a Sudoku using the Sudoku Instructions Program
Sudoku Instructions is a sudoku maker. It can make Sudoku puzzles of any difficulty: beginner, very easy, easy, medium, difficult, very difficult, and extremely difficult. Each time the program will make a new puzzle for you – previous puzzles are never repeated.
For example, if you want beginner sudoku, you just click the menu item “File” and then “New Sudoku: Beginner”:
Then you will get a beginner puzzle like this:
The number of given digits is 42. This sudoku is easy to solve. It may be well suited for kids. Sudoku Instructions is also a kid’s sudoku program.
At the other end of the spectrum, you can get the program to make extremely difficult sudoku. You just click the menu item “File” and then “New Sudoku: Extremely Difficult” as seen here:
Then you will get a sudoku puzzle like this:
The number of given digits is 18. This sudoku is extremely difficult to solve. Nevertheless, using the tricks and methods that the Sudoku Instructions Program can teach you, you will be able to solve even this puzzle.
As you can see from the “File” menu, the Sudoku Instructions Program can make sudokus of any level of difficulty. The easy puzzles can be solved using simple methods, the more difficult puzzles need advanced solving methods that the Sudoku Instructions Program can teach you.
Solve any Sudoku using the Sudoku Instructions Program
Let us solve the sudoku we have entered from a newspaper:
We look for a ‘single’, that is a square in which only one digit can be placed.
Such a square is I1 in row 1 where digit 7 must be.
(In row 1 digit 7 cannot be inside box J or box K, since both of these boxes already have the digit 7.
Still looking at row 1, digit 7 cannot be in G1, since column G already has a 7.
Therefore the 7 in row 1 must be in square I1.)
To enter 7 in that square I1 we click it (see red arrow in the picture above).
When you do that, a small window with the numbers 1 to 9 pops up at the side of square I1 (see below).
To enter 7 in the square you just click 7 in the popup window.
When you do that, 7 is placed in square I1 and the popup window disappears as shown below:
You can proceed with entering digits in this way. In fact, you can solve this sudoku just by locating squares in which only one digit can be placed (‘singles’).
If you do that you will arrive at this final solution:
Look here for more advanced solving techniques.
Sudoku Hints provided by the Sudoku Instructions Program
The Sudoku Instructions Program can give you hints, tips, and tricks for solving any sudoku puzzle. Thereby it can help improve your sudoku skills.
Consider this sudoku puzzle:
If you cannot find a square in which there can be just one single digit – ‘a single candidate’, then you can ask the program for a hint or tip.
You just click the menu item ‘Hint’. Then you will have two choices: ‘Hint 1’ and ‘Hint 2’.
If you click ‘Hint 1’ you will get this message:
This may sometimes be enough information to find the single candidate in column c.
However, if you need more help just click ‘Hint 2’. Then you will get this message:
Now that you know in which square the single candidate is located, you may figure out which digit should be in that square.
If you cannot find a single candidate, you may get the necessary help by asking the program using the menu item ‘Solve’ and ‘Find Single Candidate’ as shown here:
If you do that, you will get this message:
Here you get the information you need. Now you will also be able to see why digit 2 must be in square C4.
(In column C digit 2 cannot be inside box J or box P, where there already is a 2. In row 6 there is also a 2. Therefore in column C digit 2 can only be in square C4.)
So you place 2 in that square:
If you proceed in the same way, you will arrive at this final solution to the sudoku puzzle:
For more features that can facilitate solving sudokus see here.
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Print any Sudoku using the Sudoku Instructions Program
You can print sudoku puzzles using your own printer.
Thanks to the very powerful built-in sudoku maker the sudoku puzzles will always be completely new. Previous puzzles are never repeated.
Normally six puzzles would fit on an A4 or Letter-sized page. You would no longer need Sudoku magazines or books.
You click the menu item “File” and then “Print More Sudoku Puzzles” as seen in this picture:
Then this window will appear:
Here you can specify the difficulty and the number of sudokus you want to print. When you click “OK” the puzzles will be sent to your printer, which should be ready.
Then you will get the sudoku printouts, which may look like in this picture, showing a scan of the original printout.
In this way, you will always be able to solve sudokus, even when you have no access to a computer. Good luck!
This printing feature alone of the Sudoku Instructions program is certainly worth more than the price of $9.99 USD for the program. Think of the money you will save by not having to buy sudoku books and magazines anymore!
Advanced features of the Sudoku Instructions Program
Please note: This section will be more relevant to you and easier to follow when you have acquired the Sudoku Instructions program and the free course in Sudoku.
The candidate table
To solve a sudoku puzzle you need to locate ‘single candidates’, that is squares where only one digit can be placed.
Consider this sudoku puzzle we entered from a newspaper:
To help find the ‘single candidates’ you can get the program to display the possible candidates for each square.
You just click the program menu item ‘Options’ and then click ‘Show Candidates’.
Then all possible candidate digits (‘the candidate table’) will be shown as seen in the next picture.
The candidate table is calculated by the program. It is updated automatically when a digit is entered.
Now you can immediately see that there are ‘naked single candidates’ (red arrows) in square E4 (3) and in square C9 (8).
(These candidates are called naked because they are not hidden among other candidates.)
You can enter digit 3 in square E4 and digit 8 in square C9 by just clicking those candidate numbers.
Then the sudoku board will look like in this picture.
Now it is not so easy to locate other single candidates. You can look at each row, column, and box to see if there is a candidate digit, which occurs only once.
For example, look at row 7. Is there a candidate digit, which occurs only once in that row? Actually, there is. Within row 7 candidate digit 3 occurs only in square F7. Digit 3 is a ‘hidden’ single candidate as it is hidden among other candidates in that square. You can click that candidate digit to enter it on the sudoku board.
The program has a facility, which makes it easier to locate hidden single candidates.
You click the menu item ‘Options’ and then click ‘Define Candidates to be Displayed’.
Then this window appears:
Here you can select the candidates that should be displayed on the sudoku board.
If you select just digit 3 to be displayed, it becomes much easier to see that digit 3 is a single candidate for row 7 in square F7 as seen in the picture below.
If you display the candidate table with one digit at a time, it will be easier to locate single candidates. In this way, you can solve the sudoku faster.
Find Single Candidates
As described in the help section the Sudoku Instructions program can find single candidates for you.
When the candidate table is displayed, the identified single candidate is shown in green bold type with the square marked with a green frame, see picture below.
This is the same sudoku puzzle as above just solved a bit more.
The program has identified digit 7 in square I1 as a hidden single candidate for row 1.
You can also see this in the comments box below the sudoku board.
(Within row 1 digit 7 cannot be inside box J or K already having a 7.
Column G also has a 7, so in row 1 digit 7 can only be in square I1.)
You click the single candidate digit 7 to place it on the sudoku board.
Candidate reduction
In difficult sudoku puzzles, it may be hard to find single candidates. It may be necessary to reduce the number of candidates. The Sudoku Instructions program can help you do just that.
We will describe a relatively easy candidate reduction method: the naked candidates’ method.
Take a look at the sudoku. Is there a row, column, or box where only the same two candidates occur in two squares?
Actually, there is. In row 5 candidates 4 and 7 occur in squares D5 and E5. No other candidates are in those two squares, they are ‘naked’ here.
Thus digits 4 and 7 form a pair of naked candidates.
This means that digits 4 and 7 must be in those two squares.
Therefore these two candidates can be removed from the other squares in row 5, that is from squares A5 (7) and B5 (4 and 7). Since the naked candidates are also confined to box N, you can also remove digit 4 from square F6.
The program gives you the possibility to remove candidates “manually” so to speak.
First, you must click ‘Options’ and ‘Set Manual Removal of Candidates: On’ to enable this feature as shown in this picture.
When enabled you can remove the candidates by right-clicking on them.
After you have removed candidate 7 from A5, candidate 4 from F6, and candidates 4 and 7 from B5 by right-clicking them the board looks like this:
This candidate reduction has led to the emergence of isolated single candidates in squares F1 (5) and F6 (9). Thus you can enter those numbers in the squares.
By performing candidate reduction repeatedly, more single candidates will emerge. In this way, you can solve difficult Sudoku puzzles.
The Sudoku Instructions program offers also a number of other methods of candidate reduction. The program can find and display candidates that can be eliminated and it can also perform the elimination for you.
Additional advanced features
Here you can see an outline of some of the additional advanced solving features of the Sudoku Instructions program. The most important are methods for candidate reduction, which are summarized here.
All these additional features and candidate reduction methods are described in extensive detail in the free course in sudoku with special reference to the Sudoku Instructions program.
You will get the free course in Sudoku as a gift when you buy the Sudoku Instructions program.
Candidate reduction methods provided by the Sudoku Instructions Program
Please note: This section will be more relevant to you and easier to follow when you have acquired the Sudoku Instructions program and the free course in Sudoku.
In some sudoku puzzles, there are too many possible digits in each square – there are too many candidate digits. To solve the problem it may be necessary to eliminate some of the candidates – to perform candidate reduction.
Examples
Here are some examples of how the Sudoku Instructions program can find candidate digits that can be removed.
All methods are based solely on logic. The Sudoku Instructions program will explain clearly how these methods work.
Sudoku Instructions will show the candidate digits that the methods use in blue color. The candidate digits, which can be eliminated, are shown in red color.
Locked candidate:
In row 3 candidate digit 3 (blue digits) is only present inside box L. In this box, digit 3 has to be in row 3. It is “locked” in the row. Therefore, you can remove 3 as a candidate in the other rows inside box L (red digits).
You can do this in the program by simply clicking on “Perform This Reduction”.
Hidden candidates (pairs):
Within box J above the candidate digits 1 and 5 (blue color) are isolated “hidden” candidates in a pair (or as twins). They are called hidden because they appear hidden among other candidates – in this case, 8 (red color) in squares A1 and B1. Candidate digits 1 and 5 are isolated because they are not present anywhere else in the box. 1 and 5 must therefore be in these two squares. So, you can remove other candidates (here 8 – shown in red) from the squares.
You can do this in the program by clicking “Perform This Reduction”.
Hidden candidates in the form of triples or quads can be identified in the same way. These somewhat trickier reduction methods are explained in the program.
Naked candidates (pairs):
In row 1 candidate digits 1 and 5 (blue digits) form a naked pair (naked twins) in squares A1 and B1. They are called “naked” because they are alone in the two squares. These digits must therefore be in those two squares. You can remove candidate 5 from other squares in row 1 (red digits).
You can do this in the program by clicking the “Perform This Reduction”.
Naked candidates in the form of triples or quads can be identified in the same way. These somewhat trickier reduction methods are explained in the program.
X-wing, swordfish, jellyfish:
You can do this in the program by clicking the “Perform This Reduction”.
Swordfish (one candidate digit in just 3 rows or columns) and jellyfish (one candidate digit in only 4 rows or columns) can be identified in the same way. These difficult reduction methods are explained in the program.
Free Course in Sudoku with purchase of the Sudoku Instructions Program
You will get the free course in Sudoku as a gift when you buy the Sudoku Instructions program.
This course is very easy to follow. The course is specially adapted to the Sudoku Instructions program and includes the following topics:
Part 1
Introduction to the game of sudoku. The logical principles that are used to solve sudokus. Two simple and easy methods by which most easy sudokus can be solved. The candidate table. Isolated and hidden single candidates.
Part 2
The ‘locked’ candidate reduction method. This part describes this relatively easy candidate reduction method in great detail going through four illustrative examples.
Part 3
The ‘naked’ candidates reduction method. This method is also quite easy to use. Naked candidates can be in pairs, triples, and quads. All these three cases are described in much detail in illustrative examples.
Part 4
The ‘hidden’ candidates reduction method. This method is slightly more difficult to use. Hidden candidates can be in pairs, triples, and quads. All these three cases are described in detail in illustrative examples.
Part 5
The ‘X-Wing’, ‘Swordfish’, and ‘Jellyfish’ candidate reduction methods. These closely related methods are quite difficult to use in practice. Therefore, they are described in six detailed examples.
Part 6
Tie-breaker using Ariadne’s thread. Using this method you can solve even the most difficult sudoku. A few other advanced features of the Sudoku Instructions Program are also described in this part.
Following this course, your ability to solve sudoku puzzles will be significantly improved.
This course alone is at least worth the price of the Sudoku Instructions program.
About the Sudoku Instructions Program
The Sudoku Instructions program has been made by me: Erik Christensen. I have been programming for many years and have made numerous computer programs including programs for data management, computer graphics, and statistical analysis.
Because of my fascination with sudoku, I decided to make this program. It is quite popular in the family and among our friends. My wife, children, and other members of the family use it regularly.
I decided to offer the program on the internet to other people including you, who have reached this site right now.
The program has been tested carefully to ensure optimal performance. Thanks to efficient program coding, the program will take up very little space on your computer. The program is guaranteed free of viruses.
If you have any questions about the program, you are welcome to contact me.
Buy the Sudoku Instructions Program
The price is only $9.99 USD. This price is very low when you consider all the program’s advanced features. The program is guaranteed free of any virus or malware. Remember: You have an unlimited money-back guarantee!
To Buy: Click the blue Pay with Card button below.
When you have paid you will be transferred directly to the secure download page where you can download the program to your computer. On the download page, you will get access to the free course in Sudoku.
As extra security, you will also receive an email with the same information. So make sure that you enter your email address correctly.
I wish you the best of luck with the program!