Additional information
by Alena Gurin (Author)
The book contains 400 excellent Jigsaw Sudoku puzzles 9x9.
Jigsaw Sudoku has irregular shaped blocks as opposed to the 3x3 square blocks in a regular Sudoku puzzle. Your task is to fill each row, column and irregular shape with the numbers 1 - 9, no number may appear twice in any row or column and irregular shape.