The puzzles in this collection of treacherously difficult puzzles will stretch even the most advanced Su Doku enthusiast. You will need to use all of your best
This is Su Doku multiplied: every column, row and 3x3 box must contain the digits 1 to 9. Where the puzzles overlap, the rows and columns do not go beyond their
A collection of 200 previously unpublished Fiendish Su Doku puzzles. Perfect for the expert solver in need of a constant supply of ultra-difficult puzzles. Guar
Fiendish Sudoku Book Sudokus are puzzle games which originated in Japan and rely on number logic to solve them. You are not required to know any equations or ha
The toughest sudoku book Sudokus are puzzle games which originated in Japan and rely on number logic to solve them. You are not required to know any equations o