Impossible puzzles

Programs which generate, solve, and analyze Sudoku puzzles

Impossible puzzles

Postby Guest » Thu May 26, 2005 7:59 pm

Anyone got any really hard puzzles... I need something that's really challenging.
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Postby dcj1978 » Thu Jun 02, 2005 7:53 pm

Got this one from the program...

Code: Select all
_____________
|9.2|...|8.7|
|.54|...|23.|
|...|7.9|...|
-------------
|3.5|8.2|7.1|
|...|...|...|
|6.1|5.7|4.2|
-------------
|...|3.8|...|
|.78|...|15.|
|2.9|...|6.8|
-------------


Enjoy
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Postby scrose » Thu Jun 02, 2005 8:08 pm

Try some puzzles that require the swordfish technique. Or try the samurai sudoku. Or try the dion cube.
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Postby Drusenija » Sun Jun 05, 2005 12:20 am

dcj1978 wrote:Got this one from the program...

Code: Select all
_____________
|9.2|...|8.7|
|.54|...|23.|
|...|7.9|...|
-------------
|3.5|8.2|7.1|
|...|...|...|
|6.1|5.7|4.2|
-------------
|...|3.8|...|
|.78|...|15.|
|2.9|...|6.8|
-------------


Enjoy


I don't know how you created that puzzle, but it's certainly not a challenging one ^_~ At every step there is a number that cannot go anywhere else. If you're keeping track properly, there aren't any decisions to be made at all, it all just falls into place ^_^
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Postby lunababy_moonchild » Sun Jun 05, 2005 5:36 am

Generate you're own puzzles then.

Luna
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Postby Drusenija » Tue Jun 07, 2005 1:15 pm

It was just an observation *laughs* The original poster asked for a challenging puzzle, and that one didn't seem to fit that description.
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Re: Impossible puzzles

Postby JOTHI » Mon Jun 20, 2005 2:31 pm

Anonymous wrote:Anyone got any really hard puzzles... I need something that's really challenging.



get one of order 100 by 100 from me

my id is mailtojothi@gmail.com
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Try this one

Postby oysterkite » Thu May 24, 2007 9:58 pm

Try this puzzle. Its know as "Qassim Hamza" and some people regard it as among the most difficult puzzles ever created.

Code: Select all
 . . . 7 . . 8 . .
 . . . . 4 . . 3 .
 . . . . . 9 . . 1
 6 . . 5 . . . . .
 . 1 . . 3 . . 4 .
 . . 5 . . 1 . . 7
 5 . . 2 . . 6 . .
 . 3 . . 8 . . 9 .
 . . 7 . . . . . 2

Let me know if you are able to solve it.

[20110428 ronk-moderator edit: change dashes to periods in puzzle grid]
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re: Qassim Hamza

Postby Pat » Fri May 25, 2007 7:23 am

oysterkite wrote:Try this puzzle. It's know as Qassim Hamza
and some people regard it as among the most difficult puzzles ever created.
      [ 22 clues ]
Code: Select all
 . . . | 7 . . | 8 . .
 . . . | . 4 . | . 3 .
 . . . | . . 9 | . . 1
-------+-------+------
 6 . . | 5 . . | . . .
 . 1 . | . 3 . | . 4 .
 . . 5 | . . 1 | . . 7
-------+-------+------
 5 . . | 2 . . | 6 . .
 . 3 . | . 8 . | . 9 .
 . . 7 | . . . | . . 2


Let me know if you are able to solve it.


this may be tough enough for the Topic on "How regular is to generate sudoku with difficulty 9+ SE?"

~ Pat
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Postby StrmCkr » Fri May 25, 2007 8:51 am

here u go one of the hardest puzzles found so far

Code: Select all
 Easter Monster
 *-----------*
 |1..|...|..2|
 |.9.|4..|.5.|
 |..6|...|7..|
 |---+---+---|
 |.5.|9.3|...|
 |...|.7.|...|
 |...|85.|.4.|
 |---+---+---|
 |7..|...|6..|
 |.3.|..9|.8.|
 |..2|...|..1|
 *-----------*


heres a link to other really hard puzzles.

http://www.research.att.com/~gsf/sudoku/data/hardest-2007-04-16.dat
Some do, some teach, the rest look it up.
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Re: Try this one

Postby ronk » Fri May 25, 2007 3:02 pm

oysterkite wrote:Try this puzzle. Its know as "Qassim Hamza" and some people regard it as among the most difficult puzzles ever created.

Would you please provide a source for that puzzle ... or at least the name of its creator:?:

TIA, Ron
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Re: Try this one

Postby Ocean » Tue May 29, 2007 9:40 pm

ronk wrote:
oysterkite wrote:Try this puzzle. Its know as "Qassim Hamza" and some people regard it as among the most difficult puzzles ever created.

Would you please provide a source for that puzzle ... or at least the name of its creator:?:

TIA, Ron

Check for equivalence with this one, the so-called gold list #5:
Code: Select all
001002000030040050600700800006000007010000030900000600007001008040030020000500900
(Posted 3 nov 2006, and stayed on top of ravel's hardest list for about one month.)
Curious about what path the puzzle has taken to appear in its new form, and how it got its new name. I am pleased that somebody has enjoyed playing with it.
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Re: Try this one

Postby wapati » Wed May 30, 2007 4:17 am

Ocean wrote:Check for equivalence with this one, the so-called gold list #5:

Curious about what path the puzzle has taken to appear in its new form, and how it got its new name. I am pleased that somebody has enjoyed playing with it.


Ocean, to many of us that was a lawyer's answer.

Accurate, but of no use.

Can you attribute this puzzle (I think it is a morph of someone's, from what you said ) to anyone?

Further, do you know the first poster who named it "Qassim Hamza" ?

Thanks.
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Postby daj95376 » Wed May 30, 2007 6:21 am

wapati, I think Ocean was politely trying to say that it was one of his puzzles that was morphed into the puzzle in discussion. I suspect ronk already knew this and was trying to track down who did it. However, I'm just a simple country boy and probably completely wrong.
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Postby wapati » Wed May 30, 2007 7:32 am

daj95376 wrote:wapati, I think Ocean was politely trying to say that it was one of his puzzles that was morphed into the puzzle in discussion. I suspect ronk already knew this and was trying to track down who did it. However, I'm just a simple country boy and probably completely wrong.


You have it as I saw it.

Was any question answered?
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