Download or read book Tripod Sudoku - 200 Very Hard Puzzles 7x7 Book 4 written by Liam Parker and published by . This book was released on 2020-05-22 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: (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.