{"title":"World's Hardest Killer Sudoku Books","description":null,"products":[{"product_id":"world-s-hardest-killer-sudoku-book-djape-9781790247530","title":"World's Hardest Killer Sudoku","description":"Extreme Challenge: World's Hardest Killer Sudoku - IQ \u0026amp; Insane Levels\u003cp\u003ePrepare yourself for the ultimate test of logic. \u003cb\u003eWorld's Hardest Killer Sudoku\u003c\/b\u003e is the landmark first volume in a series specifically engineered for the elite solver. While other books claim to be difficult, this collection was the first ever to feature puzzles of this extreme caliber, specifically designed for those who find fiendish grids too simple. This book is not for beginners.\u003c\/p\u003e\u003cb\u003eThe IQ and Insane Standard\u003c\/b\u003e\u003cp\u003eIn response to requests for truly masterful challenges, this volume is packed with \u003cb\u003eIQ-level Killer Sudoku\u003c\/b\u003e puzzles, concluding with a selection of \u003cb\u003eINSANE\u003c\/b\u003e grids for the most dedicated experts. Every puzzle is handcrafted to ensure: \u003c\/p\u003e\u003cul\u003e \u003cli\u003e\n\u003cb\u003e100% Logical Solvability: \u003c\/b\u003e Despite the extreme difficulty, every grid can be solved through pure deduction without ever needing to guess.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eSingle Unique Solution: \u003c\/b\u003e Rigorous mathematical engineering ensures there is only one way to complete each puzzle.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eMaximum Difficulty: \u003c\/b\u003e These grids are designed to push your cognitive boundaries and pattern recognition to their absolute limits.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cb\u003eProfessional Grade Construction: \u003c\/b\u003e\u003cul\u003e \u003cli\u003e\n\u003cb\u003eOne Puzzle Per Page: \u003c\/b\u003e Large-scale layout provides ample space for notations, candidate digits, and complex sum calculations.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eElite Focus: \u003c\/b\u003e No basic instructions are included; this book assumes you are already a Killer Sudoku expert ready for the next level.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003ePremium Paper: \u003c\/b\u003e High-quality white paper that stands up to the heavy erasing and intense solving sessions required for these grids.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eThe Original Masterpiece: \u003c\/b\u003e This is the first book in the acclaimed series that has now expanded to five volumes due to popular demand.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cb\u003eExpertly Crafted by Djape\u003c\/b\u003e\u003cp\u003eCreated by Djape, a world-renowned puzzle expert and long-time contributor to \u003ci\u003eThe Washington Post\u003c\/i\u003e, this collection brings professional-grade rigor to every cage and sum. If you have been searching for a book that finally matches your skill level, the ball is now in your court. Grab your pencil and play.\u003c\/p\u003e","brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49563382808849,"sku":"GOR010804139","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"GB \/ GOOD \/ INTERNAL","offer_id":52459910037777,"sku":"GOR011988487","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"US \/ NEW \/ INGRAM","offer_id":53592663228689,"sku":"NIN9781790247530","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1790247535.jpg?v=1751378386"},{"product_id":"deadliest-killer-sudoku-book-djape-9781499762211","title":"Deadliest Killer Sudoku","description":null,"brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49662337679633,"sku":"GOR008107746","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"US \/ NEW \/ INGRAM","offer_id":52750933623057,"sku":"NIN9781499762211","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1499762216.jpg?v=1751340044"},{"product_id":"deadliest-killer-sudoku-book-djape-9781519108982","title":"Deadliest Killer Sudoku","description":null,"brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49662338072849,"sku":"GOR007373948","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"US \/ NEW \/ INGRAM","offer_id":51033289294097,"sku":"NIN9781519108982","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1519108982.jpg?v=1751212615"},{"product_id":"deadliest-killer-sudoku-book-djape-9781484903711","title":"Deadliest Killer Sudoku","description":null,"brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49662337909009,"sku":"GOR005465396","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"US \/ NEW \/ INGRAM","offer_id":51029482045713,"sku":"NIN9781484903711","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1484903714.jpg?v=1751211303"},{"product_id":"deadliest-killer-sudoku-book-djape-9781540452740","title":"Deadliest Killer Sudoku","description":"This is volume 4 of the acclaimed series of books with the most difficult Killer Sudoku puzzles. \u003cb\u003eAll puzzles in this volume are new, previously unpublished.\u003c\/b\u003e\u003cbr\u003e It contains only puzzles of the 3 hardest levels of difficulty: BRAIN, IQ and INSANE, with addition of a few puzzles of an even more fiendish kind - Zero Killer Sudokus. \u003cbr\u003e\u003cul\u003eContents: \u003cli\u003e40 BRAIN (5 ZERO)\u003c\/li\u003e \u003cli\u003e60 IQ (5 ZERO)\u003c\/li\u003e \u003cli\u003e12 totally INSANE (6 ZERO INSANE)\u003c\/li\u003e \u003c\/ul\u003e For a total of 112 toughest Killer Sudoku puzzles\u0026gt;\u003cbr\u003e By no means is this a book for a novice Killer Sudoku solver. It is intended only for the most experienced and most persistent of those who are already masters at solving Sudokus with sums. \u003cbr\u003e So. are you up for this challenge?","brand":"WoB","offers":[{"title":"US \/ GOOD \/ SBYB","offer_id":50389295890705,"sku":"CIN1540452743G","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"US \/ NEW \/ INGRAM","offer_id":53223561330961,"sku":"NIN9781540452740","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"GB \/ GOOD \/ INTERNAL","offer_id":53631111790865,"sku":"GOR014988439","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1540452743.jpg?v=1751308320"}],"url":"https:\/\/www.worldofbooks.com\/de-de\/collections\/world-s-hardest-killer-sudoku-books-buchreihe.oembed","provider":"World of Books ","version":"1.0","type":"link"}