Solution to Sudoku no 738

Sudoku no 738 (Extreme)

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Solution to Puzzle 19 from my Sudoku Puzzle Book

Solution to Sudoku no 737

Sudoku no 737 (Easy)

Our younger son created this puzzle using a Javascript program which he wrote himself:

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Solution to Sudoku no 736

Sudoku no 736 (Extreme)

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Solution to Sudoku no 735

This is the solution:

This is the winning answer sent in by Freddy Vargas:

Sudoku no 735 (Tough / Hard)

13th August 2024:

I wrote my sudoku creation program back in 2012.

Then in 2022 I decided to publish a book of  tough puzzles. I used my program to create puzzles again and again and passed each one to HoDoKu. I stored puzzles with a HoDoKu grade between Hard (1000) and Hard (1999) and discarded the rest. After I had created around 8000 puzzles I had the 400 tough / hard puzzles I needed for my book.

You can buy my book using the advert on this page.

Alternatively, for a chance to win a copy, solve the sudoku below. It has a HoDoKu grade of Hard (1490) so it is typical of the puzzles in my book. Send your answer to me at international_dba@yahoo.co.uk. Do not send me your address at this point. The closing date for entries is 31st October 2024. On 1st November 2024 I will choose one winner at random from all the correct solutions received and ask where to send the book.

The name of the winner and the solution will be published shortly afterwards.

1st November 2024:

This competition is now closed.

3rd November 2024:

The winner is Freddy Vargas from Colombia.

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Solution to Sudoku no 734

Sudoku no 734 (Diabolical)

They have been reporting on the TV this morning about a worldwide Microsoft IT outage which is causing disruption at airports, railways, banks etc so I decided to see if I was affected. I switched on my Linux laptop and created the puzzle below. I connected to the Internet and graded it at SudokuWiki then I published it on Google's Blogger platform. Facebook, Twitter and Linkedin are up so I should be able to share it too:

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Solution to Sudoku no 733

Sudoku no 733 (Easy)

Our younger son created this puzzle using a Javascript program which he wrote himself:

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Solution to Sudoku no 732

Sudoku no 732 (Extreme)

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Solution to Sudoku no 731

Sudoku no 731 (Diabolical)

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Solution to Sudoku no 730

Sudoku no 730 (Tough)

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Solution to Sudoku no 729