Sudoku Primer & Complete Reference

Sudoku Primer and Complete Reference

How do you pronounce primer?
If you have watched any of the Sudoku Primer videos you’ve probably noticed that the word primer is pronounced with a short i. Some have questioned whether this is the correct pronunciation. Should it be a short i (like in swimmer) or should it be a long i (like in timer)?

There are two uses of primer with different meanings and different pronunciations.

  1. A base coat of paint, or a small container of percussion powder used to ignite an explosive is one meaning. That meaning is pronounced with a long i (like timer).
  2. An introductory text or small book for teaching children is the second meaning for primer. This use of the word is pronounced with a short i (like swimmer).

If you pronounce the second meaning of the word with a long i you’re not alone. There is a difference between the British and American pronunciation. In the late 1800s there was a movement in the U.K. to make pronunciation consistent among words. At that time the pronunciation for the second meaning of primer was changed from the short i to a long i. Since then the British have pronounced both words the same. In the United States we have kept the old pronunciation, so saying it with the short i is the original way of saying it.

Now that you've read this you won't wonder why it is pronounced the way it is on these videos.

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Sudoku basics teaches you sudoku rules and the basics of the game. It is worth looking at even if you already know how to play sudoku. You just might learn some new things.

Sudoku Primer has videos on YouTube with Sudoku lessons ranging from techniques to solving entire puzzles. There are over 100 videos on YouTube now, with new ones added all the time. Click the "Videos" link on the left to see them.

Getting Started Video

Watch this video to understand how sudoku puzzles work and how to solve an easy puzzle
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Solving a very difficult puzzle

This video shows a very complex way to break through a diabolical puzzle and finish solving it
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Video Index
This page has an index of the different techniques each video talks about. Refer to this page to find specific techniques you would like to learn about.

The Challenges page tests your knowledge and skills by showing you a partially completed puzzle with a circled number. Your challenge is to figure out how that number got there, or why it is the only number that fits in that cell. Try it out, it just may improve your solving skills!

Many people use pencils and make lots of notes while solving sudoku puzzles, both in the cells and in the margins. But this is a lot of work that really isn’t necessary. This site and the book "Sudoku Primer & Complete Reference" will teach you to solve puzzles with a pen (you don't need to take notes while solving). When using these techniques the only thing you need to write is the correct number in each cell, so you can use a pen. There is one exception - called trial and error - where you will use a pencil. Trial and error is one of the skills you will learn.

Did you Know?
There are 6,670,903,752,021,072,936,960 unique sudoku combinations - See OEIS A17739 - See my research page for more information

Sudoku - the puzzle that addicts