![]() To hide the small selector temporarily, and take a better view of the puzzle, move the cursor outside of the grid. The pencil marks that are set are shown in bold. To toggle a pencil mark left-click over the number while holding down the shift key.What makes hard sudoku is the scarcity of the originally given numbers, which makes you need to use pencil marks, go through the numbers in your head and use your. Use our tutorials to learn advanced Sudoku techniques to solve this one. To delete a normal number from a cell, left-click over the same number. This Sudoku is a bit more difficult than what people are used to solve.To enter or replace a normal number in a cell, left-click over the new number with your mouse.Once enabled it appears automatically as you hover over the cells in the grid. The small selector is enabled through the options panel. The keyboard cannot be used with the small selector. The small selector is the fastest way to interact with the sudoku grid if you prefer to maximise the use of the mouse over the keyboard. The big selector closes when you enter a new number (not a pencil mark) or if you hover out of it for more than 1 second or if you click on the close button identified by a small x at the top right corner of the panel. This is useful for applying the 'colouring' techniques sometimes used for solving the most difficult puzzles. The big selector is the only control that enables you to change the background of the grid cells.To reset the background color to white, press the key marked "White".To change the background color of a cell, click on one of the coloured buttons that appear on the top-right of the selector panel.To toggle pencil marks click on the tiny number keys on the bottom left of the selector.To erase a normal number click over the key marked "Erase".To enter a normal number click over one of the big keys marked 1 to 9.The big selector appears when you left-click with your mouse on the currently active cell, regardless whether you are in pencil mark mode or normal mode. When the cursor is over the grid you can also use the up/down/left/right arrow keys to navigate between the cells. ![]()
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