Nikoli Publishing Volgorde van de boeken (chronologisch)

The ultimate collection of over 1,000 handcrafted sudoku puzzles, in a range of difficulties, handcrafted by the masters at Nikoli in Japan (whose Workman sudoku books have 1.3 million copies in print combined).

Our hardest-yet Sudoku collection, handcrafted by the puzzle masters at Nikoli in Japan (whose Workman Sudoku books have 1.3 million copies in print combined).