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The website en.sudoku-club.com had the following on the web site, "Sudoku known to us appeared in 1979 and it was published in the magazine of crosswords and jigsaw puzzles." I analyzed that the webpage said " Now sudoku can be found practically in every publishing issue." They also stated " To solve sudoku can take you from one minute to several hours. The complexity depends how many numbers have already been placed in the cells of game field. The more numbers are, the more simple for you will be to solve jigsaw puzzle. Remember, that the numbers can not be repeated in line, column or small square of game field." The meta header had sudoku as the first search term. This keyword was followed by puzzle, jigsaw, and game which isn't as urgent as sudoku. The other words they used was games. free is also included but could not be seen by web crawlers.