Linked Questions

35 votes
6 answers
36k views

What are the criteria for determining the difficulty of Sudoku puzzle?

What are the criteria for determining the difficulty of Sudoku puzzles? Is it a subjective estimation based on the author's experience, or are there any precise guidelines? For example, there are ...
user avatar
20 votes
4 answers
3k views

After here should I guess or is there a logic solution on Sudoku?

From this point is it necessary to guess or is it possible to find a logic solution?
Yordan's user avatar
  • 209
4 votes
9 answers
8k views

Sudoku false positive (wrong move)

I'm new to Sudoku puzzles. I tried solving the one above but my last move was flagged as a wrong move(highlighted red). I believe it is a false positive since the $6$(highlighted red) I inserted is ...
Emmanuel Adu Gyamfi's user avatar
7 votes
1 answer
6k views

NYT Sudoku Medium - what does this hint mean?

I have always done Sudoku on paper and can always do mediums and usually hards. I've started doing the NYT Sudoku online and too often have trouble with the medium. At this point in this particular ...
DBeck's user avatar
  • 73
4 votes
4 answers
6k views

How do I solve this sudoku without guessing?

I have filled all the possible singles. Also identified and shortlisted candidates, pointing pairs. How do I move ahead without guessing? PS: I applied "Nishio", choosing one of the two possible ...
jerrymouse's user avatar
1 vote
4 answers
336 views

What technique should be used to continue with this sudoku

I searched for x wing and the bone. Im thinking colors but not sure.
TS79's user avatar
  • 21
0 votes
1 answer
849 views

Help solve sudoku

I did solve this sudoku in 24 minutes, but I had to guess from this part out. I'm using a website to display this sudoku a lot neater than the original site. I can solve plenty of sudokus, but the ...
LifeisReal's user avatar
2 votes
2 answers
421 views

Logical Sudoku - How to tell when fully deducted?

I'm working a program that should generate bad ass sudoku puzzles. Recently I noticed there's a thing called "logical sudoku", which means it can be logical-deducted all the way to solution. The ...
Shl's user avatar
  • 163
8 votes
2 answers
440 views

What other strategies can I use with this sudoku puzzle?

I have a sudoku puzzle that I have been doing for 270 hours. I never guess numbers and always thought that every move in sudoku had to have a logical explanation. Until the app generated this random ...
Qeeet's user avatar
  • 183
4 votes
1 answer
216 views

Finding a number in this sudoku

I have been trying this sudoku for nearly 5 hours now but im unable to find any number further...If anyone could help me out i would be really grateful.. Note: The numbers in black are the prefilled ...
rohit_r's user avatar
  • 151
2 votes
1 answer
771 views

Sudoku solving strategy

I started solving the puzzle below and I got stuck at this point. I don't know how to continue solving this puzzle except using try and error. Does anyone know of a strategy to solve it?
MBS's user avatar
  • 123
1 vote
2 answers
240 views

Sudoku puzzle - where to go next?

Above is a link to a half-solved sudoku puzzle. I tried to fully solve it but just cant figure out what to do now. Source: Sudoku-Branium studios It is an app on google playstore.
vaanchit kaul's user avatar