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1 to 25 - on the iPhone
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!

Latest threads are now at the top.
In addition, posts you have NOT read are in normal colors, older ones are in grey.
Please email me if you experience problems or bugs. Cheers, Andrew Stuart

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funny little thing i stumbled upon by accident:

trying G2=3 solves all 3's and results in a 1-cell-UR in G1. this elimination makes this one an easy Setti puzzle.


by: kolumbus

different way without chain/UR:
H1≠4 (contradiction to Setti 4) -> G1≠3 -> G2≠2 -> F2=2 (Setti 2, in any case, if G1 is 2 or not)


by: Klaus

Hi kolumbus,

you consider "H1≠4 (contradiction to Setti 4)" as "without chain"?

by the way: H1<>4 is given by a Jellyfish


by: Toni

Dear kolumbus, I don't see the "contradiction to Setti 4" as both G1 and H1 can contain a 4


by: Toni

Sorry, now I see the fish! Thanks.


by: hp

interesting discussion.
chainless way to solve might be:
4 fish 4 to eliminate the 4 in H1
3 fish 2 to eliminate the 2 in E2
BCA on 6, rest does the solver


by: pax

Just also solved it with H1 can't be 4 because of setti 4 and the UR Klaus also found.
My major issue: I'm solving all puzzles on my phone (Samsung), no solver. Since today if I klick on a cell it shows me (mostly meaningless) figures as a proposal, which are hiding other fields. Very disturbing... Anybody a hint how to get rid of that?


by: Klaus

Hi pax,

had, i think the same issue some weeks ago with Chrome on my laptop.

as some other user, forgot the name, indicated, its got to do with with AutoFill-Einstellungen. i deactivate this now while solving the puzzles and that resolves the problem.


by: Ben


I recommend using It's not a solver, but allows you to enter candidates and is able to highlight digits (by clicking column heading). You simply copy&paste the is/gd/... url - or enter no url to get the weekly extreme.

I can't remember the user that wrote it.


by: pax

Add to this thread
@Ben, Klaus
Thank you for the hint, I deactivated Autofill, all fine now!



by: Rost

Please Help me. I am a Cookie. Whats tue meaning of you Post??


by: pets

@Rost: copy as URL in your browser and have fun with Leren`s X straits. X means that both diagonals A1-J9 and J1-A9 follow str8ts rules as well


by: jgrab

I failed two times, always something wrong towards the end. In find this significantly more difficult than the plain X variant below.


by: Leren

@ jgrab

If you can find the embedded solution you can check to see where you have gone wrong. Alternatively, if you have a blank cell towards the end I can give you its value. It's a bit early in the week to post the whole solution - don't want to publish a spoiler just yet.


by: Christoph

It was hard work. My solution is setti-based, incl. a head chain that excludes one of the two candidates in J1.
may be that I had a lucky failure somewhere.


by: jgrab

@ Leren: Of course, I can always inspect the solution in the resolved URL line.


by: Leren

@ Christoph

A standard fish solves G7 and J1 falls shortly after.

@ jgrab

Nice trick about the URL line. Looks like all my puzzles contain a spoiler :)


by: Christoph

I have done it once more. I can confirm that I had no lucky failure. My solution is based on standard tools, except the head chain to exclude one of the two candidates in J1, as mentiond befor.
Leren, I had not sen the fish you mentioned.
Verv nice, challenging puzzle.


by: BP

Not so medium for me, probably overlooked something. Got to 17 solved cells easily (including G7 and J1), but then needed two short head chains to remove 5 from H9 and 7 from J6.


by: Lewis

At 17 solved cells you can find an x-wing (twisted), which directly solves H4 and then the rest. So far I didn't need any (head-) chains.


by: BP

Add to this thread
@Lewis: Ah, you're right, completely missed that one! Thanks for sharing it!!!



by: pets

Thank you, Leren! Develops nicely step by step


by: Augenweide

A hard one, to me there were quite big "gaps" between pets's "steps". Hard but good, thank you Leren!


by: BP

Hard work, needed whole toolbox, many fishes, naked triples and a very short head chain. Thanks, Leren!


by: pax

Add to this thread
After a lot of CE finally a setti contradiction on 8 solved. Very hard work, indeed



Reserved for discussion of Andrew's puzzle


by: Andrejs

Add to this thread
I'd like to tell how I solved this puzzle. After finding the candidates, all sure digits and preparing all Setti, I made sure I had no idea how to proceed. I rolled over and didn't check for fish patterns. I decided to use alternative solutions.
Alternative one: A8=2/3. It managed to solve some cells.
Alternative 2: Column 1 and row G contain 3 / do not contain 3. It solved the whole puzzle.
All this of course took time and patience.

Article created on 27-June-2010.
This page was last modified on 17-April-2011.
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  • 10:51
       - Jo - 1 day ago
  • 11 min - pure logic
       - relijo - 1 day ago
  • 24`- only 1 setti needed
       - ihgs - 2 days ago
  • 36 min - one guess at F8
       - puh - 2 days ago
  • Started easy. Then got challenging, 40 min on Second try
       - Fleurette - 3 days ago
  • 14 min - second attempt; easy start, but got stuck then. Nice one!
       - Susan - 4 days ago
  • 25:40, with a little bit luck
       - SL - 4 days ago
  • 25:00 settis and logic
       - joe reitzl - 4 days ago
  • 53 minuten,
       - wjanet - 5 days ago
  • 23 min, settis and logic
       - EC - 5 days ago
  • Very hard. Finally and happily, I've got it
       - Jutta - 5 days ago
  • Settis and fish - no hints this week yea !!!
       - Big Papi 86 - 5 days ago
  • did it, but had to read the hint (i even saw the jellyfish on 4, but did not combine it with the one on 2)
       - joeB - 5 days ago
  • 34'30'' manually, lost time by not taking the clue in J1 into account 8-(
       - Jan - 5 days ago
  • 14 Min Settis
       - Max - 5 days ago
  • 23 min beim 2.versuch. sehr nett
       - angelo74 - 6 days ago
  • 17' - took me a while to see the swordfish
       - Jo - 6 days ago
  • 14 on 2nd trial makes me feel gooood....
       - emil - 6 days ago
  • 24min, standard techniques
       - COM - 6 days ago
  • 23 min settis and logic - and thanks to Korbinian
       - Hoppi - 6 days ago
  • 40' stuck until I saw Klaus' hint of a jellyfish.
       - Fab - 6 days ago
  • 25 min - setties and the lucky but obviosly guess..............
       - effchen - 6 days ago
  • 25' Setti combination is the key
       - bsz - 6 days ago
  • 22 min. Very logical for the most part.
       - D-Day - 6 days ago
  • 20 min, nice + easy
       - Boerny - 6 days ago
  • 9 min, nice
       - un - 6 days ago
  • 13:45, no tricks, no guess, just str8t ahead
       - fred - 6 days ago
  • 29' one settie.Good for me ... I like it
       - Volker - 6 days ago
  • 18 min. - many settis
       - Nessie - 6 days ago
  • with the right guess in F8 simple
       - easydoesit - 6 days ago