Solution to Sudoku no 6

Here is my original version of the solution:

...and here is another one, which Tina Park sent to me on Twitter:

Sudoku no 6 (Diabolical)

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Sudoku grader and solver

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Solution to Sudoku no 5

Here is my original version of the solution:

...and here is another version, which phoebe sent to me on Twitter:

Sudoku no 5 (Easy)

Play online 

Sudoku grader and solver

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Solution to Sudoku no 4

Here is my original version of the solution:

...and here is another one sent to me by phoebe on Twitter:

Sudoku no 4 (Moderate)

Play online

Sudoku grader and solver

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Solution to Sudoku no 3

Here is my original version of the solution:

...and here is another version, which phoebe sent to me on Twitter:

Sudoku no 3 (Diabolical)

Play online 

Sudoku grader and solver

See answer