Samurai SuDoku, Killer Sudoku and more

More unique Sudoku puzzles that you’ve never seen before – for die hard fans of big Sudoku puzzles, here is another one – Double Sudoku Harakiri X!

There are 13 classic sub-puzzles, which of course don’t have their own (unique) solutions but all together constitute a puzzle with a single solution. This time, however, you must also pay attention to diagonals: ALL diagonals in the puzzle must contain all numbers from 1 to 9. The diagonals are marked in the puzzle so you wouldn’t forget them.

Click on this thumbnail to download the puzzle.

Thoughts and comments are most appreciated (as always)!

Solution – final

Samurai Sudoku X for Tuesday, March 28 – this is the only place you can find these kind of Sudoku puzzles!

Basically, not only do you have to fight against 5 interconnected Sudokus, but you also need to be careful about the diagonals: ALL diagonals in the puzzle must contain one occurrence of each 1-9 digit. The diagonals are marked in the puzzle so you wouldn’t forget about them.

Download the puzzle by clicking on this thumbnail:

solution – final

Weekend Special: Butterfly Samurai Killer Sudoku with diagonally adjacent cells!

This puzzle consists of 20 (twenty) 9×9 Sudoku sub-puzzles. There are 5 groups of 4 puzzles. Each group of 4 is arranged Butterfly-style, and those 5 groups are arranged Samurai-style.

Please make sure you understand how the puzzles are arranged before attempting to solve the puzzle.

Also, be careful when solving this one – with diagonally adjacent cells it’s sometimes easy to miscount the number of cells in a cage and if you do that, you get the cage-sum combinations completely wrong!

Download the puzzle by clicking on this thumbnail:

solution – final

Enjoy!

A while ago I explained the X-Wing solving technique.
Recently I shown my explanation of other basic, Classic Sudoku solving techniques.

The only remaining solving method that I don’t consider trial and error is Swordfish. So, to complete the list of Sudoku solving tips, here is an example of a Sudoku puzzle that can be solved using Swordfish.

Here is the puzzle:

This is how far you can get without using Swordfish: (more…)

Udosuk posted a new problem in the “Brain Teasers” forum. It hasn’t been answered yet!

34 32 36 46 64 75 50 35 34
16 18 14 22 ?? 40 35 15 20 12


?? is a 2-digit number. What is it?

The answer is NOT the one that first crosses your mind. Can you work it out? Give it a go in the forum!