{"title":"Sudoku and number puzzles Books","description":"","products":[{"product_id":"coffee-break-su-doku-book-3-200-challenging-su-doku-puzzles-collins-su-doku-9780008343903","title":"Coffee Break Su Doku Book 3 200 challenging Su","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eQuiz your family at home with crosswords, puzzles and games.           \u003cp\u003eStretch your powers of logical deduction with these 200 new Su Doku puzzles, in easy, medium and difficult categories.\u003c\/p\u003e","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":47832463114583,"sku":"9780008343903","price":7.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780008343903.jpg?v=1710333527"},{"product_id":"big-book-of-su-doku-9-9780008469924","title":"Big Book of Su Doku 9","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eKeep your brain busy at home with everyday puzzles.A bumper collection of easy, medium and difficult Su Doku puzzles to test your mental dexterity, powers of logic and deduction. You will find 100 easy, 100 medium and 100 hard puzzles in this collection so you can gauge your progression through the difficulty levels.You will find the solutions at the back of the book.Keep your mind sharp and test your powers of deductive reasoning. Ideal for whiling away the time while travelling, on holiday or relaxing at home.","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48732094693719,"sku":"9780008469924","price":6.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780008469924.jpg?v=1719995134"},{"product_id":"guardian-news-and-media-ltd-guardian-book-of-kakuro-9780099499589","title":"Guardian News and Media Ltd Guardian Book of","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003e\u003cp\u003eWhen the \u003ci\u003eGuardian\u003c\/i\u003e relaunched their new Berliner sized paper this autumn, they chose Kakuro as one of their launch vehicles. Kakuro (called Kakro in Japan and Cross Sums in the USA) has become the new number puzzle phenomenon gathering millions of fans worldwide. Older than puzzle favourite Sudoku and played for many years in Japan, Kakuro is best described as a kind of mathematical crossword.\u003cbr\u003e\u003cbr\u003eLike Sudoku, Kakuro is played on grids of varying sizes. Each grid consists of blank and filled squares similar to a crossword puzzle and the object of Kakuro is to fill in each of the white squares with the numbers 1-9 so that each set of blanks adds up to the total to the left or above. The same number cannot be used more than once in each set. Some filled in squares have a diagonal slash across them with two numbers - one above and one below the diagonal. 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In 7th heaven when you complete them, you''ll 8 giving up on any of these - but those 9 by nines won''t complete themselves... \u003cbr\u003e\u003cbr\u003eGood luck!\u003c\/p\u003e","brand":"Penguin Books Ltd","offers":[{"title":"Default Title","offer_id":48732386099543,"sku":"9780140958355","price":7.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780140958355.jpg?v=1719996654"},{"product_id":"the-telegraph-killer-sudoku-1-9780600626497","title":"The Telegraph Killer Sudoku 1","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003ePrepare yourself to take on the challenge that is \u003ci\u003eTelegraph Killer Sudoku 1. \u003c\/i\u003eThe ultimate test of logic, these demanding puzzles will put your mind through its paces. 200 killer sudoku grids allow you to hone your puzzling skills on your commute, during your leisure time or whenever you have a spare minute!","brand":"Octopus Publishing Group","offers":[{"title":"Default Title","offer_id":48735829492055,"sku":"9780600626497","price":8.54,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780600626497.jpg?v=1723810362"},{"product_id":"the-telegraph-all-new-sudoku-puzzles-1-9780600629443","title":"The Telegraph All New Sudoku Puzzles 1","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eYou don''t need to be a maths expert to get hooked on sudoku, the nation''s favourite number challenge. Test your logic to the limit with a brand new compilation of 200 addictive grids.","brand":"Octopus Publishing Group","offers":[{"title":"Default Title","offer_id":48735830835543,"sku":"9780600629443","price":8.54,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780600629443.jpg?v=1723810363"},{"product_id":"the-telegraph-killer-sudoku-2-the-telegraph-puzzle-books-9780600633136","title":"The Telegraph Killer Sudoku 2 The Telegraph","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eThe ultimate test of logic, these challenging puzzles take sudoku to a whole new level. 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Test your logic to the limit with a brand new collection of 200 addictive grids.","brand":"Octopus Publishing Group","offers":[{"title":"Default Title","offer_id":48735842074967,"sku":"9780600634447","price":9.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780600634447.jpg?v=1723810367"},{"product_id":"the-telegraph-big-book-of-sudoku-1-9780600635604","title":"The Telegraph Big Book of Sudoku 1","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003e\u003cp\u003eThe first book in a brand new \u003ci\u003eTelegraph\u003c\/i\u003e puzzles series, \u003ci\u003eThe Telegraph Big Book of Sudoku 1 \u003c\/i\u003econtains  over 400 sudoku grids ranging from easier puzzles for beginners right  up to fiendish puzzles that will challenge even the most experienced of  sudoku-lovers. \u003cbr\u003e\u003cbr\u003eFuel your passion for puzzling with this bumper book of sudoku from the UK''s most popular quality newspaper.\u003c\/p\u003e","brand":"Octopus Publishing Group","offers":[{"title":"Default Title","offer_id":48735844368727,"sku":"9780600635604","price":9.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780600635604.jpg?v=1723810370"},{"product_id":"daily-mail-kurosu-volume-1-300-of-the-daily-mails-most-addictive-brainteaser-puzzles-the-daily-mail-puzzle-books-9780600636823","title":"Daily Mail Kurosu Volume 1 300 of the Daily Mails","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003e\u003cp\u003e\u003cb\u003eLove Sudoku? Can''t resist a crossword?\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eTry out \u003cb\u003eKurosu\u003c\/b\u003e, the latest \u003ci\u003eDaily Mail \u003c\/i\u003epuzzle. Highly addictive and utterly engaging, this is the fun alternative to Sudoku!\u003cbr\u003e\u003cbr\u003e*\u003cbr\u003e\u003cbr\u003e\u003cb\u003eThere are only two rules:\u003c\/b\u003e\u003cbr\u003e1: Fill in each space with either a nought or a cross so there are no more than two consecutive noughts or crosses in any row or column. Important note: diagonals don''t count.\u003cbr\u003e\u003cbr\u003e2: Each row and column must contain three noughts and three crosses.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e*\u003cbr\u003e\u003cbr\u003eSounds easy, doesn''t it? Think again! This book might look simple, but it''s deceptively hard - it''s the ultimate test of logic.\u003cbr\u003e\u003cbr\u003eFrom easy and medium level, to the highest difficulty rated,\u003cb\u003e \u003ci\u003eDaily Mail Kurosu Volume 1 \u003c\/i\u003e\u003c\/b\u003ewill offer hours of puzzling fun.  \u003cbr\u003e\u003cbr\u003e\u003cb\u003ePerfect for both single players and groups!\u003c\/b\u003e\u003c\/p\u003e","brand":"Octopus Publishing Group","offers":[{"title":"Default Title","offer_id":48735856558423,"sku":"9780600636823","price":8.54,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780600636823.jpg?v=1723810373"},{"product_id":"guesstimation-9780691129495","title":"Guesstimation","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eEnables anyone with basic math and science skills to estimate virtually anything - quickly - using plausible assumptions and elementary arithmetic. This book presents an array of estimation problems that range from devilishly simple to quite sophisticated and from real-world concerns to silly ones.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eTrade Review\u003c\/b\u003e\u003cbr\u003e\"Dr. Adam and his colleague Lawrence Weinstein, a professor of physics, offer a wide and often amusing assortment of Fermi flexes in a book that just caught my eye, Guesstimation: Solving the World's Problems on the Back of a Cocktail Napkin.\"--Natalie Angier, New York Times \"An important skill of great use ... is the ability to derive an approximate result from insufficient data. Guesstimation is a collection of [problems] gathered from everyday life and various fields. Working out questions ... is both entertaining and enlightening. It may also help foster your career ... because making correct guesses quickly establishes your reputation as an expert.\"--Stephan Mertens, Science \"This book is a stimulating collection that will help the reader to reach informed judgments and will be a useful source of inspiration for mathematics and physics teachers: my only concern is that if my students have read it before they arrive at university, I may have to find a new approach to my first day's teaching.\"--Tony Mann, Times Higher Education \"While few can hope to emulate the brilliance of a Nobel Prize winner like [Enrico] Fermi, coming up with pretty good guesstimates is a skill that can be taught. And that's the aim of Guesstimation. After a quick tutorial, the authors get down to business with a host of wide-ranging worked examples, from estimating the numbers of piano tuners in Los Angeles to figuring out the impact of deforestation on greenhouse gas levels. The results are sometimes surprising.\"--Robert Matthews, BBC Focus Magazine \"[Guesstimation is] a left-brain book that helps you approximate answers to the types of questions actually asked in some job interviews today.\"--Peter Coy, BusinessWeek \"[A] delightful account of mathematical approximation, which instills the beauty and power of the back-of-the-envelope calculation. The puzzles make addictive confidence builders by breaking down tricky questions into manageable parts. Never again will you take a newspaper figure at face value without feeling the need, and confidence, to guesstimate your own figure.\"--Matthew Killeya, New Scientist \"Guesstimation is both enlightening and entertaining. I recommend it to my fellow journalists both as a tool of our trade and as a mind stretcher.\"--Rony V. Diaz, Manila Times \"Any idea what fraction of land in the US is covered by either a roof or pavement? Known as a Fermi problem, this type of question requires the use of reasonable estimation, which is the focus of the book at hand. In the initial chapters, Weinstein and Adam briefly review good 'guesstimation' techniques involving numbers and explain why the use of the geometric mean is preferred over the arithmetic mean.\"--J. Johnson, Choice \"How many people in the world are picking their nose right now? Weinstein and Adam 'guesstimate' the answer to this problem and 79 others, covering chemistry, physics, biology and history. The book is a step-by-step guide to problem-solving using rough-and-ready maths, the kind done on the back of a cocktail napkin. And the authors have kindly left additional questions at the end to get readers started on their own problem-solving expedition.\"--Cosmos \"Physics educators can use this book as a guide to including the important skill of estimation in their courses. Students may find the power of estimation to be a valuable skill and will want to work their way through this book.\"--Arthur Eisenkrafr, American Journal of Physics \"A source of imaginative problems, this book would make a nice addition to a mathematics department library.\"--Diane Resek, Mathematics Teacher \"[I]t's quite obvious that the authors intend their book to be fun, nonthreatening, and user-friendly. There's very little not to like... [T]he book can be for everybody, 'higher-up professionals' who might know math but not physics, as well as students wrestling with 'word problems.' Teachers could very well recommend it to math majors and nonmajors alike, or even use it in the classroom, in some cases as supplementary reading for the course.\"--Marion Deutsche Cohen, Mathematical Intelligencer \"The cumulative effect of fairly simple paths to estimating solutions to a dizzying array of difficult problems is fascinating.\"--Ray Bert, Civil Engineering \"This book will be enjoyed by anyone with an interest in estimation, but is also targeted at those applying for jobs at companies like Google, where the kind of questions considered in the book are often used in the interview process.\"--Paul Taylor, Mathematics Today\u003cbr\u003e\u003cbr\u003e\u003cb\u003eTable of Contents\u003c\/b\u003e\u003cbr\u003eAcknowledgments xi  Preface xiii  Chapter 1: How to Solve Problems 1  Chapter 2: Dealing with Large Numbers 11  2.1 Scientific Notation 11  2.2 Accuracy 14  2.3 A Note on Units 16  2.4 Unit Conversion 17  Chapter 3: General Questions 19  3.1 One big family 21  3.2 Fore! 25  3.3 This is a fine pickle you've got us into, Patty 29  3.4 Throwing in the towel 31  3.5 Hey buddy, can you fill a dome? 35  3.6 A mole of cats 39  3.7 Massive MongaMillions 41  3.8 Tons of trash 43  3.9 Mt. Trashmore 47  3.10 Juggling people 51  3.11 Shelving the problem 53  Chapter 4: Animals and People 55  4.1 More numerous than the stars in the sky 57  4.2 Laboring in vein 61  4.3 Unzipping your skin 65  4.4 Hair today, gone tomorrow 69  4.5 Hot dawg! 73  4.6 Playing the field 75  4.7 Ewww... gross! 77  4.8 Going potty 79  4.9 Let's get one thing straight! 83  Chapter 5: Transportation 87  5.1 Driving past Saturn 89  5.2 Drowning in gasoline 91  5.3 Slowly on the highway 95  5.4 Rickshaws and automobiles 99  5.5 Horse exhaust 103  5.6 Tire tracks 107  5.7 Working for the car 109  Chapter 6: Energy and Work 113  6.1 Energy of height 114  6.1.1 Mountain climbing 115  6.1.2 Flattening the Alps 119  6.1.3 Raising a building 123  6.2 Energy of motion 126  6.2.1 At your service 127  6.2.2 Kinetic trucking 129  6.2.3 Racing continents 131  6.2.4 \"To boldly go... \" 135  6.3 Work 138  6.3.1 Crash! 139  6.3.2 Spider-Man and the subway car 143  Chapter 7: Hydrocarbons and Carbohydrates 145  7.1 Chemical energy 145  7.1.1 Energy in gasoline 147  7.1.2 Battery energy 151  7.1.3 Battery energy density 155  7.1.4 Batteries vs. gas tanks 159  7.2 Food is energy 162  7.2.1 Eat here, get gas 163  7.2.2 Farmland for ethanol 167  7.3 Power! 170  7.3.1 Hot humans 171  7.3.2 Fill 'er up with gasoline 173  7.3.3 Fill 'er up with electricity 175  Chapter 8: The Earth, the Moon, and Lots of Gerbils 179  8.1 \"And yet it moves\" (e pur si muove) 181  8.2 Duck! 185  8.3 Super-sized Sun 189  8.4 Sun power 193  8.5 Gerbils 1, Sun 0 197  8.6 Chemical Sun 201  8.7 Nearby supernova 205  8.8 Melting ice caps 209  Chapter 9: Energy and the Environment 213  9.1 Power to the people 215  9.2 Continental power 219  9.3 Solar energy 223  9.4 Land for solar energy 225  9.5 Tilting at windmills 229  9.6 The power of coal 233  9.7 The power of nuclei 237  9.8 Hard surfaces 239  Chapter 10: The Atmosphere 243  10.1 Into thin air 245  10.2 Ancient air 247  10.3 Suck it up 251  10.4 CO2 from coal 255  10.5 A healthy glow 259  10.6 CO2 from cars 261  10.7 Turning gas into trees 265  10.8 Turning trees into gas 269  Chapter 11: Risk 273  11.1 Gambling on the road 275  11.2 The plane truth 277  11.3 Life's a beach 279  11.4 Up in smoke 281  Chapter 12: Unanswered Questions 285  Appendix: Needed Numbers and Formulas 289  A.1 Useful Numbers 289  A.2 Handy Formulas 289  A.3 Metric Prefixes 290  B Pegs to Hang Things On 291  Bibliography 295  Index 299","brand":"Princeton University Press","offers":[{"title":"Default Title","offer_id":48735986549079,"sku":"9780691129495","price":16.14,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780691129495.jpg?v=1723810430"},{"product_id":"the-big-book-of-killer-su-doku-9780752880938","title":"The Big Book of Killer Su Doku","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eJust when you thought su doku couldn't get any harder...   200 all new KILLER SU DOKU puzzles!","brand":"Orion Publishing Co","offers":[{"title":"Default Title","offer_id":48737009041751,"sku":"9780752880938","price":9.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780752880938.jpg?v=1723810899"},{"product_id":"killer-kakuro-9780752880792","title":"Killer Kakuro","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eHooked on su doku?  Then move on up to kakuro!","brand":"Orion Publishing Co","offers":[{"title":"Default Title","offer_id":48737013891415,"sku":"9780752880792","price":9.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780752880792.jpg?v=1723810900"},{"product_id":"sudoku-x-the-only-puzzle-with-the-x-factor-by-monckton-christopher-author-on-jul252005-paperback-9780755315017","title":"Sudoku X The Only Puzzle with the X Factor by","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003e\u003cp\u003eSudoku X is a brand new and irresistible twist on the sensational worldwide puzzle craze. It offers something new that no other Sudoku puzzle has offered before, the instantly recognisable ''X'' formed by the diagonals.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eThis first Sudoku X book includes 100 puzzles, varying in difficulty, and also in shape and size. 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In collaboration with The Times, Collins  the no 1 puzzle publisher  are proud to publish it in the UK.KenKen is a brain-training puzzle based on logic and simple arithmetic. Perfect for all ages and highly addictive, KenKen puzzles challenge and entertain in an entirely new way. The puzzle was invented by a charismatic Japanese maths teacher, Tetsuya Miyamoto in 2004. The name comes from Ken' which is the Japanese word for clever and KenKen translates assquare wisdom'. It's based on simple arithmetic and each puzzle involves some or all of the following skills: addition, subtraction, multiplication and division.As with Su Doku there are clearly defined levels for each type of puzzle from beginner and intermediate to advanced and the puzzles can be on any size grid, from 3 x 3 up to 9 x 9. The puzzles improve numeracy, logical thinking, concentration and perseverance.Can you KenKen?","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48863828771159,"sku":"9780007288243","price":999.99,"currency_code":"GBP","in_stock":false}]},{"product_id":"the-times-killer-su-doku-5-9780007305858","title":"The Times Killer Su Doku 5","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eChallenge yourself at home with word and number puzzlesThis fifth and toughest addition to the successful Times Killer Su Doku series will test your skills to the limit, adding the challenge of arithmetic and taking Su Doku to a new and even deadlier level of difficulty.The puzzles use the same 9x9 grid as Su Doku but with an added mathematical challenge. The aim is not only to complete every row, column and cube so that it contains the digits 1-9, it is also necessary to ensure that the outlined cubes add up to the same number.With 150 new Tough and Deadly Killer Su Doku puzzles, there is no chance to ease yourself in with easy puzzles. For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for The Times'' toughest collection yet.","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48863831818583,"sku":"9780007305858","price":8.54,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780007305858.jpg?v=1722269220"},{"product_id":"the-times-fiendish-su-doku-book-2-9780007307364","title":"The Times Fiendish Su Doku Book 2","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eChallenge yourself at home with word and number puzzlesA new collection of previously unpublished Fiendish Su Doku puzzles with the added bonus of 30 Super Fiendish puzzles. Perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles. Guaranteed to provide hours of absorbing, brain-stretching entertainment.The puzzles in this collection are of the highest quality supplied by Sudoku Syndication, the Sudoku suppliers to The Times newspaper.Since the first Su Doku puzzle appeared in The Times in November 2004, they have become a phenomenon, with over 5 million copies of The Times Su Doku books sold worldwide. You don''t need to be a mathematical genius to solve these puzzles; it is simply a question of logic. Each puzzle has a unique solution  and there''s no guesswork required.The Times Su Doku remains the original, the best and the market leader.","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48863831982423,"sku":"9780007307364","price":7.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780007307364.jpg?v=1722269223"},{"product_id":"the-times-ultimate-killer-su-doku-book-2-120-of-the-deadliest-su-doku-puzzles-the-times-su-doku-9780007364527","title":"The Times Ultimate Killer Su Doku Book 2 120 of","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eChallenge yourself at home with word and number puzzlesFor those who like to live dangerously and push beyond their mental comfort zone, steel yourself for the second book in The Times'' toughest Killer series yet.Prepare for the extreme mental challenge of 100 Deadly-level Killer puzzles, including, exclusive to The Times, 20 Extra Deadly, to really test your limits: this is the only series in which you''ll find such a torturous collection.The Times Ultimate Killer Su Doku 2 is not for the fainthearted. 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The aim is not only to complete every row, column and cube so that it contains the digits 1-9, it is also necessary to ensure that the outlined cubes add up to the same number as well.If the first Ultimate Killer Su Doku didn''t scare you off  see how you fare after tackling this one","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48863841976663,"sku":"9780007364527","price":7.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780007364527.jpg?v=1722269272"},{"product_id":"the-times-killer-su-doku-book-8-9780007440672","title":"The Times Killer Su Doku Book 8","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eChallenge yourself at home with word and number puzzlesThe newest volume in the hugely popular Killer Su Doku series from the puzzles suppliers to the Times, featuring the highest-quality puzzles with an extra element of arithmetic.This eigth addition to the successful Times Killer Su Doku series will test your skills to the limit, adding the challenge of arithmetic and taking Su Doku to a new and even deadlier level of difficulty.The puzzles use the same 9x9 grid as Su Doku but with an added mathematical challenge. The aim is not only to complete every row, column and cube so that it contains the digits 1-9, it is also necessary to ensure that the outlined cubes add up to the same number as well.With 150 new Moderate, Tough and Deadly Killer Su Doku puzzles, there is no chance to ease yourself in with Easy puzzles. 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These diabolically difficult Ultimate Killer Su Dokus will really put your brainpower to the test as you warm up with the 100 Deadly Killer puzzles before steeling yourself to take on the 20 Extra Deadly Su Dokus. Are you ready for the challenge?The Times Ultimate Killer Su Doku 4 is not for the faint-hearted. The puzzles use the same 9x9 grid as a regular Su Doku, but have an extra mathematical element that makes them a real challenge. 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The aim is not only to complete every row, column and cube so that it contains the digits 1-9, it is also necessary to ensure that the outlined cubes add up to the same number as well.With 150 new Moderate, Tough and Deadly Killer Su Doku puzzles, there is no chance to ease yourself in with Easy puzzles. For those who like to live dangerously and pushbeyond their mental comfort zone, steel yourself for The Times'' next, terribly tough instalment.","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48863853412695,"sku":"9780007465194","price":7.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780007465194.jpg?v=1722269329"},{"product_id":"the-times-super-fiendish-su-doku-book-1-9780007580743","title":"The Times Super Fiendish Su Doku Book 1","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eChallenge yourself at home with word and number puzzlesA new title in the Fiendish Su Doku series, concentrating entirely on the more difficult Super Fiendish puzzles. These are previously unpublished quality Su Doku grids from the puzzle providers to The Times, and help to develop you to take on Extreme Su Doku.The 200 puzzles in this collection of treacherously difficult puzzles will stretch even the most advanced Su Doku enthusiast. You will need to use all of your best solving techniques to get to the end of this testing challenge.The puzzles in the collection are of the highest quality and are perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles.Guaranteed to provide hours of mind-stretching entertainment.","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48863873007959,"sku":"9780007580743","price":7.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780007580743.jpg?v=1722269408"},{"product_id":"the-times-samurai-su-doku-3-9780007580774","title":"The Times Samurai Su Doku 3","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eQuiz your family at home with crosswords, puzzles and games.For anyone who loves the challenge of Su Doku but manages to solve them within minutes, you can now enjoy the extended mental workout and ultimate endurance test of a five grid interlinked system.This is Su Doku multiplied: every column, row and 3x3 box must contain the digits 1 to 9. Where the puzzles overlap, the rows and columns do not go beyond their usual 9x9 length but the interlocking boxes give you more clues  and more complexity.With another 100 new Samurai puzzles to vex you for hours, lose yourself in the four levels of this book:10 Easy40 Mild40 Difficult10 Super difficultEven the speediest of Su Doku solvers will be agonising over these ultra-complex, extended brain-teasers.These are the most difficult Su Doku puzzles in The Times range.","brand":"HarperCollins Publishers","offers":[{"title":"Default Title","offer_id":48863873139031,"sku":"9780007580774","price":10.44,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0817\/1739\/5799\/files\/9780007580774.jpg?v=1722269409"},{"product_id":"the-times-super-fiendish-su-doku-book-2-9780008127510","title":"The Times Super Fiendish Su Doku Book 2","description":"\u003cb\u003eBook Synopsis\u003c\/b\u003e\u003cbr\u003eChallenge yourself at home with word and number puzzlesThese are previously unpublished quality Su Doku grids from the puzzle providers to The Times, and help to develop you to take on Extreme Su Doku.The 200 puzzles in this collection of treacherously difficult puzzles will stretch even the most advanced Su Doku enthusiast. 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