Irregular Even Sudoku (Guest Authors Sudoku #1)

This Irregular Even Sudoku Puzzle was created by "Ritesh Gupta" and his brother "Hitesh Gupta" for Indian Sudoku Mock Tests. This puzzle type also appeared in World Sudoku Championship 2008 and World Sudoku Championship 2007. This Irregular Even Sudoku puzzle type one can find now in many Sudoku championships. Thanks to the authors of this Sudoku for their contributions to Guest Authors' Contributions.

Rules of Irregular Even Sudoku

Fill in the grid from 1 through 9 so that every row, every column, and every outlined region contains distinct digits. The colored boxes represent even numbers only.

Even Sudoku (Guest Authors Sudoku #1)