This book is for savvy sudoku solvers who are looking for puzzles that are harder than hard Features:-200 fearsome puzzles-Edited by legendary New York Times crossword editor Will Shortz-Portable and affordable package Also in the series: 'Will Shortz Presents Tough Sudoku''Will Shortz Presents Terrifying Sudoku'
- ISBN10 031260789X
- ISBN13 9780312607890
- Publish Date 19 January 2010
- Publish Status Active
- Out of Print 19 October 2012
- Publish Country US
- Imprint Saint Martin's Griffin,U.S.
- Format Paperback (US Tall Rack)
- Pages 320
- Language English