Playing sudoku daily can boost your concentration, ease depression and even prevent Alzheimer's disease. Can you imagine that there are 5,472,730,538 possible sudoku puzzles? The Times in London helped spread Sudoku to Western culture by publishing its first daily sudoku in 2004. Therefore, in the sudoku game, we have to fill in numbers without repetition. Any solved row, column, or cell should add up to 45. If you solve a part of the puzzle but you simply can’t find an answer to another part of the puzzle and it seems impossible, check your work. You can play medium sudoku for free on your mobile, tablet or computer. Unlike easy puzzles, medium-level sudoku requires a little more complex techniques (to solve these puzzles only by logic). If you solve a row, column, or cell, use the 45 rule to confirm the solution. Have fun free medium level sudoku online and progress in learning this logic game. What is Sudoku? 'Su' in Japanese means numbers while 'Doku' means single. Double-check solved sections with the 45 rule. The best part of the game: This free online sudoku game delivers a new puzzle each and every day! Interesting Facts about Sudoku The goal of the game is to fill every square on the grid with a number from 1-9, where the numbers can only appear once in every row, column and 3x3 box. You can place notes, find sudoku tips, manage the timer and save the sudoku game by clicking the menu bar in the top-right corner. Worried about damaging your sudoku puzzle with eraser marks? When you play our free online sudoku game, there's no need! You can choose easy sudoku, medium sudoku, or even sudoku for experts if you are confident. A puzzle is to fill a 9-by-9 grid with integers from 1 through 9 so that each integer appears only once in each row.
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