Holmes presents a collection of classic sudoku to support the mind in amazing shape. hard sudoku, excellent mental workout. KaKuro is a logical numerical puzzle, the mathematical equivalent of a crossword puzzle. In the cells it is necessary to place the numbers from 1 to 9, there are inactive cells (marked in black). In cells with given numerical values, the upper right value indicates the sum of the digits in the row, and the value from the lower left position is equal to the sum of the digits of the column below the cell. For example, the number 6 can be represented as a sum of 2 and 4 or 1 and 5; the same numbers (3 and 3) are not allowed.Sudoku puzzle killer - you need to fill in the empty cells with numbers from 1 to 9, each of the numbers should appear only once in each row and column of the 9x9 square. The sum of all numbers in the cell must match the number printed in the corner. They can be called figurative or geometric, they also have names (Sums Sudoku, Sums Number Place, Samunamupure, Kikagaku Nampure, Sumdoku). 400 unique Sudoku puzzles. + 250 sudokus difficult level that can be downloaded and printed. + 250 maze puzzles that can be downloaded and printed. Only 1 verified solution. All answers are at the end of the book. Exclusive puzzles. Good mind support in excellent form. An excellent book for free time and mind exploration. I hope you enjoy the book. Best regards, Basford Holmes