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Since there has been interesting strategy discussion on these puzzles and by popular request, I have opened an archive on the last thirty weeks. The discussion section is open for continued posting.
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Puzzles 1 to 250 are available as Puzzle Packs, just $5.49. Pack 3, 4 and 5 just released!

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Okay, found it, was an autofill issue in the new update.


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Does anyone uses chrome? only happens in chrome for me, latest update.
Since 1-2 weeks, in all str8ts puzzles, when i click on an empty cell i get a few values to choose from a list instead of being empty. The list differ in values for each empty cell i click on. This list wasn't around before. Emptied the cache, images, even new install.
Anyone an idea?





by: jgrab

After 29 solved cells, when all 6,7 and 8 were clear, didn't find how to continue. Settis were mutually dependent. Probably a clever chain?


by: Jan

Arrived at the same position, also using a nice elimination on both diagonals with an isoceles triangle of cells.

A guess on C9 solves easily, but leading the other candidate to contradiction appears to be difficult. Can't see anything working with 1 and 9, either.


by: ABC

Look at the 9s in this position. In combination with Setti 3 you can exclude 9 in B9.


by: Christoph

my key was F6, where the position of 7 was defined through the diagonal /. For the rest I used standard tools incl. one UR.
Thanks, Leren, nice puzzle.


by: Susan

Quite a challenge. Thank you, very nice.


by: Augenweide

@ABC: your hint did the job: it is then all about the mandatory 4 in B, 3 in col 9 and 3 in \ diagonal. Excellent!


by: Ben

Add to this thread
At 29 solved, I considered the 1's. Specifically if H2=1, with cols 7&8, all 1's in col 6 are eliminated.

I don't follow ABC's hint.


Christoh _X_465
7 clues:
14 black cells:


by: Christoph

correct: Christoph_X_465


by: Leren




by: Christoph

Thanks, Leren, for the correct transformation.


by: jgrab

Too difficult for me; mutual interdependencies on the diagonals. Borrowed the A1 hint from the headline, then it was easy.


by: Harm

Thank you Christoph (and Leren) for this nice puzzle. Solved it with CE, Settis without chains


by: Christoph

B9 was the key for me to clear the interdepency on the diagonals.


by: Flo

Puh...what a beast! Took me hours! Thank you Christoph for this challenging puzzle!!


by: Ben

A great puzzle, Christoph. Challenging, but very solveable.

First a simple SI solved the hi/lo in col 7. Then a short head chain to prove A2 couldn't be 7.


by: jgrab

If B9=5, J1=1; if B9=3, J1=3. E5=4 right from the start. So what does that help?
But now I see: If J1=1, a bigger chain leads - via B9 - to A1=J9=7, so J1=3.


by: Christoph

@jgrab: dig. \ : 5 to be in C3 or J9. if B9=5 -> C3 = 5, thus 7 in H8 or J9, thus A1=68, thus A2 =7, thus C2 - G2 = 2-6, thus:
J1 = 1 and J2 = 1 , thus conflict. This solves.


by: jgrab

Add to this thread
@ Christoph: Thanks. Your proposal goes also across A1 and J9, like mine, but pursues a different idea. BTW: H8 can only be 68, after local elimination bottom right, so B9=5 immediately leads to J9=7.

Article created on 27-June-2010.
This page was last modified on 17-April-2011.
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Copyright Syndicated Puzzles Inc, 2010-2011

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  • 27' at 2nd try
       - Hel - 3 hours ago
  • heck, that wasn`t easy
       - easydoesit - 5 hours ago
  • 19 min - Settis and logic and a little guess in the end
       - Susan - 1 day ago
  • Several hours, but got there in the end!
       - Fleurette - 1 day ago
  • 28 min, setiis, x-wings, one well hidden at the beginning, no chain needed.
       - u - 1 day ago
  • key was the correct elimination of numbers in E2 for row E. Then settis and at last, a short chain.
       - Benny_42 - 1 day ago
  • 35 Min. 2nd try. Whole bunch of settis
       - D-Day - 1 day ago
  • 49 min
       - hopplahierkommich - 1 day ago
  • 42' settis, but also needed a short chainn at the end
       - ThomasF - 1 day ago
  • 48 min with some setties, a small chain and simple elimination at the end
       - Teerodde - 1 day ago
  • 1:02:30
       - Sabine - 1 day ago
  • Good difficulty level. 30 min on second attempt. After Settis, CE in col 3 and row E open the path. A little chain at the end.
       - jgrab - 1 day ago
  • 50 min lots of settis and x-wings, chain at the end.
       - juehe - 1 day ago
  • 39min - 2nd try; needed a chain at the end
       - COM - 1 day ago
  • 31 min. - very nice one :))
       - Nessie - 1 day ago
  • 29 min: two settis and a little chain at the end
       - JimKnopf - 1 day ago
  • 21 min; nice one
       - jlo - 1 day ago
  • 28 min, settis, logic, chain 8o(
       - Boerny - 1 day ago
  • Available time and complexity do not match today - i gave up.
       - Korbinian Bär - 1 day ago
  • 32 min, easy settis
       - 7iron - 1 day ago
  • 40 min, 2nd attempt. No chain, no setti needed. Start with x-wing, then y--wing and CI with further x-wings. Really a nice one.
       - Toni - 1 day ago
  • 30 min with a good decision in D3, settis, nice
       - hrw - 1 day ago
  • 37' with guess at the end
       - Greg - 1 day ago
  • 20 min. settis, one x-wing, and a little chain at the end. a nice one!
       - Stadtlicht - 1 day ago
  • 43 min
       - Kurt - 1 day ago