Solution to Sudoku no 570

Sudoku no 570 (Tough)

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Solution to Sudoku no 569

Sudoku no 569 (Extreme)

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Solution to Hidoku no 6

Hidoku no 6 (7 by 7)

I created the solution to this puzzle using a C program which I wrote myself.

I created the puzzle from the solution using a Python program written by Rainhard Findling 

I rendered the image below using Amit Kuba's Online Hidoku Solver If you enjoy my puzzle, you will find many more to try there.

Here is a reminder of the rules:

I arranged the numbers 1 through 49 in ascending order on the grid below before removing some of them at random. Your job is to replace the numbers I have removed. When you have finished, the grid must contain all the numbers 1 through 49 exactly once and cells with consecutive numbers must be joined horizontally, vertically or diagonally:

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Solution to Sudoku no 568

Sudoku no 568 (Diabolical)

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Solution to Sudoku no 567

Sudoku no 567 (Easy)

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Solution to Sudoku no 566

Sudoku no 566 (Extreme)

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Solution to Sudoku no 565

Sudoku no 565 (Diabolical)

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Solution to Sudoku no 564

 

Sudoku no 564 (Extreme)

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Solution to Sudoku no 563

Sudoku no 563 (Moderate)

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Solution to Sudoku no 562

Sudoku no 562 (Diabolical)

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Solution to Sudoku no 561

Sudoku no 561 (Tough)

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Solution to Sudoku no 560

Sudoku no 560 (Extreme)

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Solution to Sudoku no 559

Sudoku no 559 (Easy)

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Solution to Example from Sudoku no 558

Hodoku explains it as follows, with reference to the picture below.

Row 2 can have its 7 in 2 different squares, both marked in green.

Row 9 can also have its 7 in 2 different squares, both marked in green.

The 7s could be in:

R2C5 and  R9C6

or

R2C5 and R9C7

or 

R2C7 and R9C6

Whichever combination you choose, 7 must be removed as a candidate from R3C6.

It calls this a skyscraper:

Example from Sudoku no 558

I worked on sudoku no 558 until I got to the position below, where there is a hidden single value of 6 to be placed in row 9 column 5.

What is the next step after that?

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Solution to Sudoku no 558

Sudoku no 558 (Extreme)

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Solution to Sudoku no 557

 

Sudoku no 557 (Extreme)

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Solution to Sudoku no 556

Sudoku no 556 (Moderate)

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Solution to Sudoku no 555

Here is my original version of the solution:

...and here is another version, which Susu Smitzh sent to me on LinkedIn:

Sudoku no 555 (Tough)

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Solution to Sudoku no 554

Sudoku no 554 (Extreme)

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Solution to Sudoku no 553

Sudoku no 553 (Easy)

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Solution to Sudoku no 552

Sudoku no 552 (Tough)

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Solution to Sudoku no 551

Sudoku no 551 (Easy)

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Solution to Sudoku no 550

Sudoku no 550 (Diabolical)

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Solution to Sudoku no 549

Sudoku no 549 (Tough)

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Solution to Sudoku no 548