Why don't I receive a ranking for my solution time?Ī rank is only shown if you complete a puzzle without being told about mistakes by the 'How am I doing?' button. However it does not match the mean, since the distribution of solving times is positively skewed.
By definition, a solution time at the 50% percentile matches the median. The "Average" shown is now back to the median - we briefly switched to showing the mean, but this appears to have caused confusion with the percent ratings. The graph on the statistics page shows the number of puzzles solved within one minute of each point. Finally, puzzles which took over two hours are excluded, since this could be due to a period of inactivity.
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This ensures puzzles that were solved by trial and error are not counted (if 'How am I doing?' was clicked and there were no mistakes, the puzzle is still included.) The statistics also ignore puzzles that were paused or selected by number, since they might have been printed and solved on paper. The analysis excludes puzzles where the user was corrected by the 'How am I doing?' button. The statistics for solution times are based on four million puzzles solved during one week on. Obviously there is also variation between different puzzles, so even within a level some puzzles may seem harder than others. An easy Sudoku can be solved using more simple logic, whereas an evil puzzle needs deeper analysis. The difficulty of a puzzle is related to the depth of thinking required. How do you classify the levels of difficulty? Of course, there are many different puzzles that can be made from the same completed grid, depending on where the blanks are placed. How many different Sudoku puzzles are there?Īccording to this page, there are 6,670,903,752,021,072,936,960 different completed 9x9 Sudokus. In some web browsers, you can type Control-Zero (Command-Zero on Mac) to quickly reset the size.
Make sure your browser's zoom setting is set to normal size or larger. What happened to the thicker lines around the 3x3 boxes? Once you are certain, remove the extra symbol. The number will appear smaller and in a different color, to differentiate it from numbers you are sure of. Type in the number followed by a symbol of your choice, such as a question mark (?). Make sure 'Pencil Marking' is on in the 'Options' page. How can I pencil in a single number as a possibility? This option is only available if JavaScript is enabled in your browser. The numbers automatically shrink to show up to 5 possible numbers entered.
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Alternatively, download Web Sudoku Deluxe which allows puzzle solutions to be retrieved and printed.Ĭheck the 'Pencil Marking' box on the 'Options' page, then type more than one number in any blank cell.
Sorry, we don't provide solutions to the Sudoku puzzles on the site - that would make it too easy! However, you can click 'How am I doing?' for assistance - hopefully this will help you find your way. There's a Sudoku article at Wikipedia which contains many more solving tips. Also look for rows, columns or 3x3 boxes which are almost full, and see if you can place any of the numbers that are missing. To get started, look for a number that appears a lot in the grid, and try to work out where else it should go. This means you should only enter a number once you're sure about it. Think logically about the puzzles, rather than guessing. Web Sudoku - FAQs - Frequently Asked Questionsįor questions about Web Sudoku Deluxe, please see the support page.Ĭan you give me some tips for solving Sudoku puzzles?
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