Samurai SuDoku, Killer Sudoku and more

Here is another Sudoku overlapping puzzle variation. As far as I know, it was invented by Ruud from www.sudocue.net – please correct me if I’m wrong.

So I thought I should give it a go at creating one such puzzle – and of course I had to add something to it. So, my variation is Clueless X. There are 9 classic Sudoku X puzzles with no overlapping regions! If you attempt to solve them individually – you won’t get far: none of those 9 puzzles has a unique solution.

Here is where the “clueless” part comes in: in all of those 9 puzzles, the center nonet has no starting clues. As you plug in your numbers, center nonets (shaded in grey) start filling up. The trick is that those 9 center nonets, put together, also constitute a valid Sudoku X puzzle. So, when you run out of ideas, start working on the 10th puzzle and it will give you enough information to solve the whole lot. Those 10 puzzles together have, of course, a single solution.

Clueless Sudoku X for Thursday, April 6 – this is the only place you can find these kind of Sudoku puzzles!

Download the puzzle by clicking on this thumbnail:

solution – final