Sudoku Puzzles

Amazing! I've never seen a petroglyph that complicated or complete!

I saw Native American pictographs (Petroglyphs) while on vacation recently in Wawa, Ontario area. So interesting and yet a little strange to be seeing something left for their future generations.

Really tough today.

Acording to Wikipedia... "Petroglyphs are found world-wide, and are often (but not always) associated with prehistoric peoples.
The word comes from the Greek words petros meaning "stone" and glyphein meaning "to carve" (it was originally coined in French as pétroglyphe)."

1. Note pairs 18 at di7;f8.Locked 2s at df9,h9=3.Unique possibilities to 40.
2. If i3=1,1s are locked at df1.If i3=8,d7=8,d1=1.Hence c1=69.
3. If e7=6,a9=6=f5;bottom middle box is devoid of 6.So e7=3.UPs to 45.
4. If c4=5,i6=5,d6=6,d9=5.If c4=1,h2=1,e2=6,f3=5=a5.Either way,a9=9 and UPs to 81.

25:20 Maen! That's not mountain sheep, those are reindeer!

Dont like modern art.

One of those sheep looks more like an anteater.

Evidently, the aboriginals had street gangs with spray cans.

Interesting stuff:

http://climb-utah.com/Misc/ninemile.htm

~35 minutes

A shorter version of step 4:Whether d6 or f5=5,a5 or d9=5,making a9=9.

That round shape in the middle looks strangely like my Mum's old webber BBQ!

1) Start at 23, basic techniques to up40.
2) (5)a5=f5-d6=d9 => a9<>5
3) (6)a5=f5-d6=d9 => a9<> 6, UP=81

Very efficient solution, Neil.Regards,Alfred.

Alfred, Thanks. But I can only do about one of about every 2, 3 or 4 without comments from you, Sotir, Steve, Clark, Dave, etc. When I cannot do them (and I never look at other people's solutions first), I then look to see if I can learn anything - and usually do learn something. Best regards, Neil

Hi Neil,
Also we can use Remote Pairs for step 2 and 3:
RP(56):a5=f5-d6=d9,=>a9<>56.UP=81
BTW:In my comment above,I missed (8)a2 from original grid.
Best Regards,Sotir

Thanks Sotir, I spotted them as remote pairs, but didn't know the correct notation. Best regards, Neil

28:28

SE=6.6