![]() the length of a 1-3-6 series is 3.)įirst seen odd/even Sudoku: If odd, the first odd number in the corresponding direction or, if even, the first even number. MaxAscending Sudoku: The length of the longest series of ascending digits in the corresponding direction. The game starts with a number of fields pre-filled. Each unit (row, column or box) must have each number exactly once. Higher skyscrapers block the view of lower ones, size being given by the digit. Sudoku is a number puzzle where the objective is to fill every row, column and box (3x3 grid) with the numbers from 1-9. Skyscraper Sudoku: The number of visible skyscrapers from that side. Next-to-6 Sum Sudoku: The sum of all direct neighbours of the digit 6 in the row or column. ![]() Outside-2 Sudoku: Must be placed in one of the first two cells in the corresponding direction. As an example, the cage in the top-left of this puzzle contains three cells, and they must add up to 17. The cells in each cage must add up to the given total. The grid is split up in to cages each cage contains 2 or more cells, and has a total in the top-left corner. Outside clues per variant show:ĭifference Sudoku: The difference of the first two digits in the corresponding direction. This is an example of a completed Killer Sudoku puzzle. Normal 6圆 sudoku rules apply to all sudokus, so each row, column and region must contain 1-6. A circle is an outside clue for both adjacent puzzles. This is one large puzzle, consisting of six different variants of 6圆 sudokus, all linked together by circles. Alternatively, click the notes button in the lower right corner, and then click the numbers in the button bar. To take notes, click the small numbers inside a cell when it is selected. So must every column, as must every 3x3 square. Every row must contain one of each digit. Enter digits from 1 to 9 into the blank spaces. May not work on non sudoku grids or special constraints. Then click a number in the button bar to set or clear the number for the selected cell. Easy Medium Hard Evil Today's Variation JigSawDoku Each Sudoku has a unique solution that can be reached logically without guessing. Hard and Medium level Sudoku often require certain tactics to solve them. Hotkeys Selection Select cells + Mouse click/drag Add or remove from current selection Move selection +, + Add to current selection + Select all cells + + Deselect all cells + Invert selection, Tool sensitive selection Number Entry Insert value, pencil mark, candidate or colour Insert value, pencil mark, candidate or colour Button Insert value, pencil mark, candidate or colour Change Tool, Next mode +, Previous mode "Digit" mode ( on German keyboard layout) "Corner" mode "Centre" mode "Colour" mode + Enter digit in "centre" mode + Enter digit in "corner" mode + + Enter digit in "colour" mode Undo / Redo + Undo last action + Redo last action if it was undo Check finished puzzle Button Press the check button to test basic sudoku rules. Medium Sudoku is a logic puzzle which is harder than an easy one and requires certain tactics to solve it.
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