{"product_id":"skill-builder-sudoku-medium-to-hard","title":"Skill Builder Sudoku: Medium to Hard","description":"\u003cb\u003eBuild up your sudoku skills from easy to expert!\u003c\/b\u003e \u003cp\u003e\u003c\/p\u003e In this three-book series, each book helps solvers build their skills to get from one level to the next. \u003ci\u003eMedium to Hard\u003c\/i\u003e will build on the skills learned in the first book, \u003ci\u003eEasy to Medium\u003c\/i\u003e, gradually introducing more advanced techniques (like jellyfish and finned X-wings) alongside puzzles designed to hone those skills, giving solvers plenty of opportunity to practice, and to build the confidence to continue on to the next volume.\u003cdiv style=\"display:none\"\u003eISBN-10: 1454958871\u003cbr\u003eISBN-13: 9781454958871\u003cbr\u003eAuthor: Gordon, Peter, Longo, Frank\u003cbr\u003ePublisher: Puzzlewright Press\u003cbr\u003e\n\u003c\/div\u003e","brand":"Puzzlewright Press","offers":[{"title":"Paperback (Feb 2026)","offer_id":46100019085509,"sku":"9781454958871","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0708\/6414\/2533\/files\/9781454958871.jpg?v=1776647209","url":"https:\/\/www.inveni.store\/products\/skill-builder-sudoku-medium-to-hard","provider":"Inveni","version":"1.0","type":"link"}