The most difficult variant of Sudoku: Killer Samurai Sudoku, lots of these puzzles put together in volume 5 of the series. In addition, 25 Jigsaw Samurais, so you can consider them a gift. 🙂
- 60 Killer Samurai Sudoku puzzles
- 15 Diagonal Killer Samurai Sudoku puzzles
- 25 Jigsaw Samurai Sudoku puzzles
Already available on Amazon. Click on the following image to get to your country-specific Amazon website.
Previous volumes available here:
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