The rules are simple: you must put a digit in each box so that every row and column, but also every 3x3 box, contain all digits from 1 to 9. This Japanese puzzle game is recommended by math teachers as a way to improve your logical thinking and has become quite popular all over the world. Sudoku is a mathematical puzzle game that seems very simple on the surface, but can prove to be quite challenging. 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.Puzzles are both entertaining and offer you the possibility to improve your thinking patterns.

MaxAscending Sudoku: The length of the longest series of ascending digits in the corresponding direction. Higher skyscrapers block the view of lower ones, size being given by the digit. 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. Outside clues per variant show:ĭifference Sudoku: The difference of the first two digits in the corresponding direction. 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.

May not work on non sudoku grids or special constraints. 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.

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