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Sudoku
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The goal is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3?3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. Fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column and 3x3 box.

Jigsaw Sudoku
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Each puzzle containing given clues in various places. The goal is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column and irregular shaped box. Fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column and irregularly shaped box.

Kakuro
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Each puzzle consists of a blank grid with sum-clues in various places. The object is to fill all empty squares using numbers 1 to 9 so the sum of each horizontal block equals the clue on its left, and the sum of each vertical block equals the clue on its top. In addition, no number may be used in the same block more than once

PostHeaderIcon Our Company

nonzero organized the first world sudoku championship. visite official wsc 2006 site. Our company was the first company to pubblish sudoku in Italy. Actually pubblish various sudoku and puzzles magazine= nonzero were the first company to publish sudoku in Italy. Over the years we have succesfully published sudoku and other logic puzzles magazines. In 2006 nonzero held the first edition of both the Italian and the World Sudoku Championships and have been holding the Italian Championship every year since, while taking part in World Championships as the Italian National Sudoku team.