Suguru Puzzle BooksSuguru Also called ampldquoNumber Blocksampldquo or ampldquoTectonicsamprdquo is a logic puzzle invented by Naoki Inaba. The puzzle consists of a grid divided into multiple outlined regions.Each region must be filled with each of the digits from 1 to the number of cells in the region. So a singlecell block contains the digit 1 a block of two cells contains the digits 1 and 2 and so on.The aim is to fill the grid so that no same digit is touching not even diagonally.ThisampnbspSuguru Puzzle Bookampnbspis aampnbspfunampnbspway for teens or adults to sharpen their minds and test their logic. Includingampnbsp504 Puzzlesampnbspof varying size and difficulty to keep youampnbspentertained for hours.ampnbspampnbspNonogram Puzzle Book FeaturesLoads of Puzzles 504 PuzzlesSuitable forampnbspall Levels 168 x Easy 168 x Medium and 168 x Hard PuzzlesPerfectly Sizedampnbsp 7 x 10Solutions Can be Found at the Back of the BookPremium Matte Color CoverPuzzle King Publishing Puzzle Books for Everyone