Normal sudoku rules apply. A correct digit placed in a cell clears the fog around it. Sissa's Lines: Each line has a beginning and an end, but neither is marked. Every cell on a line has an associated value. Starting from the beginning of the line, each cell’s value is twice the value of the previous cell. The digit in each cell is the digital root of its value: keep adding the digits of the number until you get a single digit from 1 to 9. Example: A cell with value 32 contains 5 (3 + 2 = 5). The next cell has value 64 and therefore contains 1 (6 + 4 = 10 → 1 + 0 = 1). On each line, exactly one cell matches its value.
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