{"product_id":"way-beyond-black-belt-sudoku-isbn-9781454933571","title":"Way Beyond Black Belt Sudoku®","description":"\u003cdiv\u003e\u003cdiv\u003e\n\u003cb\u003eGo way beyond difficult, with the hardest, most brain-busting sudoku you’ve ever seen!\u003c\/b\u003e\u003cbr\u003e  \u003cbr\u003e Calling all sudoku-solving diehards: with every puzzle requiring upper-level strategies, this collection packs even more of a punch than our previous \u003ci\u003eBeyond Black Belt Sudoku\u003c\/i\u003e. 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?\u003c\/div\u003e\u003c\/div\u003e","brand":"Puzzlewright Press","offers":[{"title":"Default Title","offer_id":47819566547173,"sku":"NP9781454933571","price":11.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1842\/7735\/files\/4f066ca4-d716-4dd9-9b4d-b2ae00048bcf.jpg?v=1767988711","url":"https:\/\/k12savings.com\/es\/products\/way-beyond-black-belt-sudoku-isbn-9781454933571","provider":"K12savings","version":"1.0","type":"link"}