What is Even/Odd Sudoku

Even/Odd Sudoku is a rather simple Sudoku variant. An Even Sudoku or Odd Sudoku has a certain number of cells with an even or odd number highlighted. The Even/Odd Sudoku on this website has all even numbers highlighted. This is the same Even/Odd Sudoku which was part of the Sudokus of the Sudoku World Championship 2006. An Even/Odd Sudoku is solved just like a classic Sudoku.