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Search Closest Nine Sudoku (1211)
Instruction:
Apply classic sudoku rules. Some arrows are marked in the grid. Each arrow points to the digit 9 in the respective row, column or diagonal. The digit in the cell with the arrow is the distance from this cell to the corresponding digit 9. For each diagonally oriented arrow, the digit in the cell with the arrow shows the distance to the closest digit 9 in that direction.