4 Types of Sudoku Puzzles of a Very Difficult Level. 400 Collection Puzzles.

Mega fitness for the mind and energy for the brain. 100 Lighthouse Battleship puzzles 10x10 + 11x11 + 12x12 + 14x14 very hard levels. 100 Yajilin puzzles 10x10 + 11x11 + 12x12 + 14x14. 100 Calcudoku sudoku puzzles 9x9 very hard levels. 100 Tridoku Sudoku puzzles 9x9 very hard levels. Unique 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. An excellent book for free time and mind exploration. I hope you enjoy the book. Best regards, Basford Holmes