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Avoid making assumptions about hidden cells. Focus on the information currently visible and use it to unlock more of the puzzle.
Yes. Standard row, column and box logic remains essential. The difference is that not all information is available immediately.
Focus on the visible area and use every available clue. The first goal is usually to create enough progress to reveal additional cells.
The fog clears as progress is made in the puzzle, revealing additional information that can help with later deductions.
No. Fog Sudoku is designed around deduction. Work with the visible information and let the hidden areas reveal themselves naturally.