2. Each row, column and square (9 spaces each) need to be filled out with the numbers 1-9 without repeating any numbers within the row, column or square.
3. Sudoku is a game of logic and reasoning, so you shouldn't have to guess. If you don't know what number to put in a certain space, keep scanning the other areas of the grid until you see an opportunity to place a number. But don't try to "force" anything - Sudoku rewards patience, insights and recognition of patterns, not blind luck or guessing.
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