Even-Odd Sudoku

Even-Odd Sudoku: fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Cells with gray circles must contain odd digits, cells with gray squares must contain even digits.

The formats of sudoku files:

• EOS - Even-Odd Sudoku (9 x 9);
• EOS6 - Even-Odd Sudoku (6 x 6);
• EOS8 - Even-Odd Sudoku (8 x 8).