{"product_id":"second-degree-black-belt-sudoku-9781402737176","title":"Second-Degree Black Belt Sudoku®","description":"\u003cp\u003eChallenge your mind with the \u003cstrong\u003eSecond-Degree Black Belt Sudoku®\u003c\/strong\u003e by \u003cstrong\u003eFrank Longo\u003c\/strong\u003e, an engaging puzzle book that elevates your Sudoku skills to the next level. Published in 2005, this 192-page book is perfect for those who have mastered the basics and are ready to tackle more complex challenges. The unique grading system, inspired by karate, categorizes puzzles by difficulty: start with the White Belt for easy puzzles, progress to Green Belt for medium, Brown Belt for hard, and finally confront the super-tough Black Belt challenges. Ideal for puzzle enthusiasts and anyone looking to sharpen their problem-solving skills, this book promises hours of stimulating entertainment. Dive into the world of Sudoku and see how far you can go!\u003c\/p\u003e","brand":"Frank Longo","offers":[{"title":"Default Title","offer_id":51099308589398,"sku":"9781402737176","price":7.84,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/3206\/6390\/files\/9781402737176.jpg?v=1755718948","url":"https:\/\/www.laufgard.com\/products\/second-degree-black-belt-sudoku-9781402737176","provider":"Bookshop","version":"1.0","type":"link"}