The Book of Impossible Sudoku is an ideal gag gift. It contains 100 different Sudoku puzzles that all look possible at first glance, but turn out to be impossible to solve if you dare to try!
The Book of Impossible Sudoku is an ideal gag gift. It contains 100 different Sudoku puzzles that all look possible at first glance, but turn out to be impossible to solve if you dare to try!