For beginner of sudoku puzzle, the grid can show all possibile candidates when "Auto-update candidates" option is selected. When you are stuck without knowing what to do next, our powerful hint system not only highlights the cell for a suggested value assignment, all related cells and puzzle units (column, row and block) are marked with distinct colors to help you understand the reason for such an assignment. A text illustration of the technique we are applying is provided as well. Therefore, you can quickly learn all commonly used sudoku skills.
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