This could well be the most difficult puzzle I’ve ever created. Yet, unlike some
previous ones which were intentionally created to require trial&error, this one can surely be solved without guessing.
This is a
Zero Killer Sudoku puzzle in a
Clueless format. Once more I want to thank
Ruud for inventing the “Clueless” arrangement of puzzles.
For those who are new to the Clueless concept, I would first suggest to try and solve some earlier puzzles of this sort. Here is a link to
Clueless Sudoku X and here is a link to
Clueless Killer Sudoku.
Rules: There are 9 Sudoku puzzles with
no overlapping regions! Solve them according to the rules of Sudoku and use the given cages as clues. Small numbers shown in each cage indicate the sum of cells that constitute that cage.
Numbers cannot be repeated in a cage! If you only look at the 9 sub-puzzles, you won’t be able to solve the whole lot! Why? Because there is the 10th sub-puzzle hidden! Here is where the “clueless” part comes in: in all 9 puzzles, the center nonet is completely empty. 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 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 Zero Killer Sudoku for Thursday,
August 30, 2007 – this is the only place you can find this kind of Sudoku puzzles!
Click on the puzzle thumbnail to access the puzzle.
Previously I said that you should not attempt to solve these puzzles because they’re too difficult. This time I’d like to here from you what you think!
