Tridoku Sudoku book. Hard and very hard levels.: 400+ puzzles. Holmes presents the sudoku book for keeping the brain in excellent shape. (plus 250 sud

Tridoku. The puzzle consists of nine large triangles. Each of them contains nine small triangles. Figures from 1 to 9 should be placed in the cells of each large triangle. The field contains additional lines, the cells of which must also contain non-repeating numbers. Two adjoining triangular cells should not contain the same numbers (even if the cells touch each other with only one point).200 hard levels sudoku puzzles. 200 very hard levels sudoku puzzles.+ 250 sudokus extreme level that can be downloaded and printed.+ 250 maze puzzles that can be downloaded and printed.Unique puzzles.All sudoku tested and rechecked. Only 1 verified solution.The answers are at the end of the book. Exclusive puzzles.A great book for free time and studying the mind.I hope you enjoy the book.Best regards, Basford Holmes