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Normal Sudoku rules apply. Place the digits 1-9 once in every row, column, and box.
Modifiers: There are 9 types of modifiers, each modifying the value of a digit for the purposes of arrows. Each type of modifiers appears in every row, column, and box. No two or more modifiers may occupy the same cell. The modifiers apply the following operations to the digit n:
1. n*1     2. n*2     3. n*3
4. n*4     5. n*5     6. n*6
7. n*7     8. n*8     9. n*9
Anti-king: Cells a king's move away from each other may not contain the same digit. (But they may contain the same type of modifiers.)
Arrow: The values of cells on an arrow must sum to the value of the cell in the corresponding circle. For the lines, either end of the line may be the circle of the arrow, which must be determined by the solver.
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Sudoku

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