Q&A for How to Create a Sudoku

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Question

How can I make money by making my own sudoku puzzles?

Community Answer

You could create a site with free sudokus and put ads on the site. You could also use ad.fly to let people download them for free -- ads show up while downloading, so you get a little money for each download. Or, simply make a large collection of them and sell as a printable PDF for a certain amount of money.

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Question

How do I know if it is correct?

Community Answer

You can try it out and see if you can solve it correctly. If not, you will realize where there are errors and be able to correct them.

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Question

After I create a full page Sudoku, how do I know how many numbers to remove?

Logan Eichfeld

Community Answer

This depends on how difficult you want your puzzle to be. If you want your puzzle to be easy, remove a small amount of numbers from the grid. If you want your puzzle to be intermediate, then remove a moderate amount of numbers from the grid. if you want your puzzle to be hard, remove a large amount of numbers from the grid.

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Question

Is it possible that a Sudoku can have many answers?

Community Answer

In some cases, a Sudoku puzzle can have two solutions, so it definitely is possible. It's just more common for them to have one.

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Question

How many unique legal 9x9 sudokus can be made?

Community Answer

There are 6,670,903,752,021,072,936,960 distinct ways to fill the sudoku grid, ignoring symmetries, rotation, etc. If you eliminate solutions that look different but are functionally identical, 5,472,730,538 distinct ways to fill the grid remain. The number of actual puzzles you could construct from these grids is essentially limitless.

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Question

Can you still claim a sudoku puzzles if you got it from a generator?

Ascot Ng

Community Answer

You can probably still claim it because there are 6,670,903,752,021,072,936,960 puzzles that are possible.

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