Grand load and energy for the brain. 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. Hitori. This is a logical puzzle. Cross out repeating numbers so that none of them appear in one row or column more often than once. The crossed out cells can touch each other only with angles, but not sides. Unsolved cells should constitute a continuous "white" space, that is, none of them should be isolated from the others. Only unique sudoku puzzles. These puzzles develop memory and logical thinking. Each Sudoku has only one proven solution. All answers are at the end of the book. + 250 sudokus difficult level that can be downloaded and printed. + 250 maze puzzles that can be downloaded and printed. An excellent book for free time and mind exploration. I hope you enjoy the book. Best regards, Basford Holmes