These are first-class sudoku puzzles for brain charging. 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. BrickWallDoku. A brick wall is a logical puzzle. Fill the grid with numbers so that in each row and in each column they do not repeat. On each brick, one number is even, the other is odd. Unique puzzles. + 250 sudokus difficult level that can be downloaded and printed. + 250 maze puzzles that can be downl0aded and printed. Only 1 verified solution. All answers are at the end of the book. Exclusive puzzles. An excellent book for free time and mind exploration. I hope you enjoy the book. Best regards, Basford Holmes