Rules of 6x6 Odd/Even Sudoku
Place a digit from 1 to 6 in each empty cell so that each digit appears exactly once in each row, column outlined region.
Additionally, all the cells which can contain the odd/even numbers are greyed.
Even-Odd Sudoku 6x6: fill in the grid so that every row, every column, and every 2 x 3 box contains the digits 1 through 6. Cells with gray circles must contain odd digits, cells with gray squares must contain even digits.