Playful variations that use letters instead of numbers
Select puzzles for experts, including the diabolical Target Sudoku
"A thrilling new puzzle certain to delight fans of Square Sudoku."—Michael Mepham, bestselling author of The Book of Sudoku and the Sudoku to Go series
Step up and test your wits with this fiendish new twist on traditional Sudoku. This collection of Circular Sudoku puzzles, put together by the inventor of the puzzle himself.