Normal sudoku rules apply. A digit in a cell with a circle is the same as the number of the surrounding cells (not counting the cell itself) with odd numbers. (So there is a total of 8 possible surrounding cells). All possible circles are given.
Normal sudoku rules apply. A digit in a cell with a circle is the same as the number of the surrounding cells (not counting the cell itself) with odd numbers. (So there is a total of 8 possible surrounding cells). All possible circles are given.