Sudoku Windoku - 200 Hard to Master Puzzles 9x9 (Volume 7)

Sudoku (also known as "Number Place") is a placement puzzle.
The puzzle is most frequently a 9 x 9 grid made up of 3 x 3 subgrids (called "regions").
Some cells already contain numbers, known as "givens".
The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 9 exactly once.
Each number in the solution therefore occurs only once in each of three "directions", hence the "single numbers" implied by the puzzle's name.

Windoku (also known as "Four-Box Sudoku", "Hyper Sudoku") is a variant of sudoku, contain additional four regions 3 x 3.

The puzzle book contain:
- 200 Puzzles
- Handy 6 x 9 inch Book Layout
- 2 Puzzles per Page
- Ideal for Experts

In the book you will find a description and examples of solutions for all puzzles.
The book is for those who like logic and math problems. Decide, developing and improving.