Download or read book Puzzles for Brain - Chain Sudoku 200 Hard to Expert Puzzles 9x9 written by Alexander Rodriguez and published by Createspace Independent Publishing Platform. This book was released on 2018-10-18 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sudoku Chain is similar to the Jigsaw Sudoku, each one have regions of irregular shapes.Consists of a group of circles arranged in a square grid and containing given clues in various places. The object is to fill all empty circles so that the digits appear exactly once in each row, column and chain.