Unique Numbers: Ensure every row, column, and irregular area has unique numbers from 1-9.Each of these areas must also contain the numbers 1 through 9 with no repetition. Irregular Areas: Unlike classic Sudoku, the 9x9 grid is divided into several irregularly shaped areas.No Repetition: Each row, column, and outlined area must contain no repeated numbers from 1 to 9.Numbers: You must fill each cell of the grid with numbers from 1 to 9.Grid: The puzzle consists of a 9x9 grid.The primary distinguishing feature of this puzzle is the presence of irregularly shaped, non-rectangular areas, which replace the traditional 3x3 boxes found in standard Sudoku. To print multiple puzzles, there are special pages to print two, four, or six puzzles per page.Jigsaw Sudoku, also known as 'Geometry Sudoku', 'Geometry Number Place', 'Irregular Sudoku', or 'Kikagaku Nanpure', is a variant of the classic Sudoku puzzle. Guessing is never required - but it may help! Each puzzle has a unique solution and can be solved with pure logic. The position is saved as 81 digits at the end of the URL string, with hyphens used for empty cells.Įxtreme Sudoku posts five new puzzles every day. To save any position, right-click on under the grid, and click Add To Favorites or Bookmark This Link.

You can add symbols too, such as question marks. If you prefer to enter your own pencilmarks, up to six digits can be entered in each cell. These update by themselves as you solve particular cells and cannot be edited manually. There are automatic pencilmarks that appear if you check the Pencilmarks box. So it's possible to have incorrect digits that don't conflict, but eventually you will get stuck. The Show Conflicts button does not apply the solving logic - just checks whether there are any conflicting digits already in the grid. To print the puzzles use either the Print button below the grid, or if you want to print the pencilmarks as well, use the browser Print option under the File menu. See our guide to solution rules for hard sudoku puzzles.Īll the puzzles on this site rate a 'fiendish' category, but then we picked the hardest, and graded them in five progressively more difficult categories: Evil, Excessive, Egregious, Excruciating, and Extreme, in order from least difficult to most difficult. Difficulty depends on the type of steps required to solve them, and also on the number of each type of step. Solving these puzzles is a different matter entirely, since these are the most difficult puzzles we create.

Each row, column, and 3 x 3 box must contain only one of each of the 9 digits. Just place the digits from 1 to 9 in each empty cell. Then try some of our very hard sudoku puzzles.

Daily jigsaw sudoku to print