My new book World Of Sudoku : Vol # 7 is out and is available on amazon in paperback and on payhip in pdf form. The book contains 200 handcrafted classic sudokus in four difficulty levels - easy, medium, hard and evil. My solving times for each sudoku are mentioned. So you can compare your timings with those of mine (My solving speed is pretty decent).
The link for amazon is https://amzn.to/3Nfqkn5
The link to payhip is https://payhip.com/WorldOfSudoku
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