Intro - sudoku , one of the most popular puzzle games of all time. our free sudoku is the most fun brain game you will ever play online. history - number puzzles appeared in newspapers in the late 19th century, when french puzzle setters began experimenting with removing numbers from magic squares. le siècle, a paris daily, published a partially completed 9×9 magic square with 3×3 sub-squares on november 19, 1892. it was not a sudoku because it contained double-digit numbers and required arithmetic rather than logic to solve, but it shared key characteristics: each row, column and sub-square added up to the same number. - on july 6, 1895, le siècle's rival, la france, refined the puzzle so that it was almost a modern sudoku. it simplified the 9×9 magic square puzzle so that each row, column and broken diagonals contained only the numbers 1–9, but did not mark the sub-squares. although they are unmarked, each 3×3 sub-square does indeed comprise the numbers 1–9 and the additional constraint on the broken diagonals leads to only one solution. - these weekly puzzles were a feature of french newspapers such as l'echo de paris for about a decade but disappeared about the time of world war i. about this game - sudoku cool is a sudoku game - 3 level: easy, medium,hard - version 1.0
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