The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called 'boxes', 'blocks', or 'regions') contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.


"Sudoku (yap.数 独 su: doku) - a puzzle with numbers. Sometimes sudoku is called a magic square, which is generally incorrect, since sudoku is a 9th-order Latin square. Sudoku is actively published by newspapers and magazines around the world, Sudoku collections are published in large numbers. But it became especially popular to play Sudoku online. Sudoku is a popular leisure activity.
In the 18th century, Leonard Euler invented the game Carré latin (Latin Square). Based on this game, special numerical puzzles were invented in North America in the 1970s.
So, in the USA, sudoku appeared for the first time in 1979 in the Dell Puzzle Magazine. Sudoku gained real popularity in the 1980-1990s, when the Japanese magazine ""Nikoli"" began to regularly publish this puzzle on its pages (since 1986). Sudoku is an essential component of many newspapers today. However, the most popular was the decision to sudoku online."
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