Sudoku Puzzles

is it winter?

dolphins!

i love dolphins. My first time finishing a tough puzzle

It's Winter.. 15.10 tough.. Pretty Dolphins..

10:48 is that good for my first tough one? Morning all.

26:48

4:28 :)

I compiled and sent to Gath a complete proof of the tough September 14 puzzle (the same posted in the Proofs section on this page), written in my chess-like notation (see my comment on September 16
tough). Let me know if you are interested to see it
(if only for seeing how the notation works).

5:57

Hi,
Yesterday andrei and rick asked for a way of logical advancing in tough 09/16. Go see comments.

24:04 got interupted three times. this really threw me off.

My first tough one...there shouldn't be a 'show incorrect moves' button...it's too tempting especially if you have a need for speed.

Thanks gb for your hints on yesterday's puzzle. I hoped for something more neat than eliminating a wrong possibility by assuming it and deducing a contradiction. Of course one needs persistence and vision (or computer assistance?) for locating wrong possibilities that can be quickly eliminated this way ...

annoyed because I guessed at least twice must have missed something

I enjoyed the sudoku games presented today. I did not time myself but I found the tough one a little easier to complete than the Hard one.

Great site!

Help! I find the 'hard' ones relatively easy, but the 'tough' ones impossible!! What am I missing? Where should I go for help??

it's so much fun

20:12 Again a coupel guesses. I have yet to find a tough where I didn't have to guess once or twice before everything else slid into place. I guess my logic isn't strong enough yet :(

done this in 4:04. piece of cake. can you make them harder for me please

19:57

17:02

21:41..04/25/06

done

18:55

May 16, 2007.

42 mts.!

8.19