![]() ![]() May not work on non sudoku grids or special constraints. Continue using logic and deduction until you have filled in all of the empty squares.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. Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Then look for single empty squares in each row and column that you can fill in. If you see a single empty space in a larger square, fill that in first. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. ![]() To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. The grid is divided into 9 separate 3 x 3 squares. Sudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. ![]()
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