Holmes introduces sudoku logic puzzle book to the pinnacle of mastery. The Kakuro levels are 15x15 + 16x16 + 17x17 + 18x18. 9x9 Chain sudoku puzzles medium - hard levels. A chain of Sudoku puzzles with the names: "Sudoku Girus", "Strymko". Book for superior mental support. In addition, there are links to download 500 puzzles. I hope you enjoy this book. Best Regards, Basford Holmes