Tripod Sudoku - 200 Hard Puzzles 9x9 (Volume 18)

Tripod Sudoku is a variation of sudoku, where the borders of regions are not defined.
The goal is to fill the grid with digits and divide the grid into regions.
Each digit appears exactly once in every row, column and region.
All points where three lines meet are given.
There are no points where four lines meet. 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.