Solution to Sudoku no 678

Sudoku no 678 (Easy)

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

Sudoku grader and solver

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Solution to Sudoku no 677

Sudoku no 677 (Diabolical)

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

Sudoku grader and solver

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Solution to Sudoku no 676

Sudoku no 676 (Extreme)

Please comment below if you manage to solve this sudoku puzzle.

Sudoku grader and solver

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Solution to Sudoku no 675

Sudoku no 675 (Moderate)

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

Sudoku grader and solver 

See answer