Book Star Puzzle 400+ Sudoku. Very Hard Levels.

Tridoku. Consists of six large triangles.Numbers from 1 to 9 should be placed in the triangular cells of each large triangle. Each line (of any length, even broken) contains non-repeating numbers. The row on the outer edge of the grid includes a cell located at thenearest sharp end of the figure.400 Very hard levels Star 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.All 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