World's Longest Sudoku Puzzle

Are regular sudokus starting to seem too easy? At 21 feet, 9 31/44 inches long, and with 8,929 empty squares to fill, this huge puzzle adds big excitement to the popular game. It's composed of 167 regular-sized (9x9) sudoku puzzles, linked together at 3x3 corners. Among the noteworthy features here: each individual puzzle's starting numbers are symmetrically placed in the puzzle, and no more than 30 numbers are given. Also, each 9x9 puzzle has a unique solution: no two are alike. And, finally, the difficulty level increases as you progress from left to right, becoming quite formidable by the end.Longo, Frank is the author of 'World's Longest Sudoku Puzzle ', published 2006 under ISBN 9781402737626 and ISBN 1402737629.