{"product_id":"9781454933571-way-beyond-black-belt-sudoku-r","title":"Way Beyond Black Belt Sudoku (R)","description":"\u003cmeta content=\"text\/html; charset=utf-8\" http-equiv=\"Content-Type\"\u003e\u003cp\u003e\u003cspan\u003eGo way beyond difficult, with the hardest, most brain-busting sudoku you've ever seen!\u003cbr\u003eGo way beyond difficult, with the hardest, most brain-busting sudoku you've ever seen!  Calling all sudoku-solving diehards: with every puzzle requiring upper-level strategies, this collection packs even more of a punch than our previous Beyond Black Belt Sudoku. Get ready, because you'll encounter common advanced techniques with curious-sounding names like XYZ-Wing, Finned X-Wing, Sashimi X-Wing, Swordfish, Jellyfish, Gordonian Rectangle, and Gordonian Polygon. And you might find some tricky new things here, too, from Grouped X-Cycle and Simple Grid Coloring to 3D Medusa and Bi-Value Universal Grave. The sudoku generally become increasingly difficult as the book goes along, from \"pretty darn hard\" to \"excruciating.\" Are you up for the challenge?\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Rarewaves","offers":[{"title":"Default Title","offer_id":56449882915190,"sku":"9781454933571","price":6.11,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0092\/7504\/8033\/files\/stand_39683313.jpg?v=1770261908","url":"https:\/\/www.rarewaves.com\/products\/9781454933571-way-beyond-black-belt-sudoku-r","provider":"Rarewaves.com","version":"1.0","type":"link"}