Sudoku X also called Diagonal Sudoku. Each puzzle consists of a 9x9 grid containing given clues in various places. The object is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column, diagonal and 3x3 box. The puzzle books series contain: - 250 Hard Puzzles - 250 Master Puzzles - Handy 6 x 9 inch Book Layout - 6 Puzzles per Page - Ideal for Experts The book is for those who like logic and math problems. Decide, developing and improving.
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