Super Sudoku

I have created many very difficult puzzles, which I am naming as Super Sudoku. They are meant for the Sudoku experts. Each puzzle will take an expert more than 30 minutes to solve manually, without the aim of automated solvers.

Here are samples of these puzzles. Take my challenge and see if you can solve them within 30 minutes.

If you like these puzzles, you can order the PDF copy of my books at only $4 per volume. Each book contains 128 puzzles. You can buy a complete set of 4 volumes at $12 only. You will be given the PDF copy and will be allowed to print one copy only.