Of course you've mastered Sudoku. I mean, c'mon! The ones in the newspaper are so lame!
How about Kaukauro? Well, if you can even find one in your local paper, you're lucky. Even then, Kaukauro puzzles often have multiple possible answers and sometimes you simply HAVE to guess? Yuck!
Fear not, people with too much time on your hands! I present to you the Sudoku-Kaukauro hybrid!

Thanks for the link!
Glad you enjoy the puzzles.