83
votes
Accepted
47
votes
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Must any "hourglass" touching the hexagon, in a Sudoku Hoshi, contain the same number twice?
I'd like to add a simple, direct proof:
- 21.4k
44
votes
39
votes
Accepted
Empty sudoku puzzle
The solution is:
or, in text form:
Explanation (not the fastest way, I realized some improvements while writing it):
- 28.1k
39
votes
Accepted
Do sudoku answers always have a single minimal clue set?
Here are two proper, irreducible sudoku with the same solution as each other and disjoint sets of clues (24 & 25 clues, respectively).
...
- 21.3k
37
votes
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Sudoku like you've never seen it before
This seems to fit:
The initial step was to replace all 1's (red) with a 2 (black) and all 9's with an 8:
Then, whenever a red number was +/- 1 of a black number which was on the same row, column or ...
- 8,870
35
votes
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Why does generating a Sudoku work in lines, but not in a random pattern?
You will be forced to backtrack more quickly if you proceed line-by-line, because the sudoku constraints are enforced line by line (and column by column and in each sub-square). If you fill in cells ...
- 438
35
votes
Accepted
Happy Pi-Day! Try to solve this "PiDoku"
For the sake of completeness, there are actually 3 possible solutions. Using process of elimination and deduction can get you to this point:
One solution is given by Sid already:
But two more are:
...
- 8,093
35
votes
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MASTERING Sudoku
Final solution
Step by step deduction
Firstly, note that MASTERING is a full nine-letter word so it takes up a whole row, and EMIGRANT is an eight-letter word so the column is either EMIGRANTS or ...
- 117k
35
votes
Sudoku like you've never seen it before
I have been asked by a couple of people to show the creation process for this puzzle, so here we go:
Also if people want to see more of these strange, Sudoku mash ups then I'll be more than happy to ...
- 62.8k
34
votes
Accepted
Japanese Fusion Alphabet Soup
The completed dish
The reasons why
The ultimate message
Follow the directions
My answer
- 150k
30
votes
Happy Pi-Day! Try to solve this "PiDoku"
Here's the solution: I will provide the explanations within the next 24 hours because now I have to go to bed.
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29
votes
Who am I??? Wait, isn't this a sudoku?
The next part of this puzzle can be found at:
How I got this:
So, what to do next:
- 10.5k
28
votes
Accepted
The Determinant Sudoku
Final solution
Step-by-step explanation
In each of the 2x2 boxes with determinant 0, we have four numbers $a,b,c,d$ between 1 and 9 such that $ad=bc,a\neq b\neq d\neq c\neq a$. This leaves ...
- 117k
28
votes
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Can a standard Sudoku puzzle contain a miniature Sudoku puzzle?
The answer is
Let's try it out:
- 12.3k
27
votes
This new puzzle type needs a name
Wrap-up: The Making Of This new puzzle type needs a name
This is not a solution to the puzzle, but provides notes from its poser. This type of answer has been approved by the community.
Caution: This ...
- 150k
27
votes
Accepted
Didn't you ask me for a crossword?
This puzzle is certainly not
Solving the crossword:
The clues:
Then solving as a 'Wordoku':
(Not posted logical path as it is quite straightforward, but can if needed)
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26
votes
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25
votes
Accepted
Who am I??? Wait, isn't this a sudoku?
EDIT : wrote the complete answer.
Take a look at the grid submitted by OP.
There's also those intriguing blue squares.
We can move on.
I'm struggling with the 'spoiler' blocks.
Here comes my ...
- 771
25
votes
Accepted
Are you radical enough to solve this SURDOKU?
Surd-lution (sorry :P):
To start:
Now the step by step:
1:
2:
3:
4:
5:
6:
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24
votes
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Sudoku as Poetry: A Tag-Fusion Masterpiece
The poem is ...
The completed sudoku puzzle looks like this
- hopefully no errors made in the transcription from the original text version
Original text version solution - this is what I ...
- 41.7k
24
votes
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A 16 Clue Sudoku Puzzle (but the kings can't be in check)
If I didn't make any mistakes, this should do:
Insights into the solving process:
- 21.8k
23
votes
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A Page of Puzzling
The solution is
The crossword was first solved by @NeilW, and @Sconibulus solved the alphametic and the maze (go upvote them!).
For the Sudoku:
For the Anagram:
For the Logic puzzle:
Back to the ...
- 5,099
22
votes
Accepted
This is a crossudoku
The filled grid looks like this:
Several of the clues have only a single possibility considering that we know the number of digits and that all digits have to be unique. The second clue especially ...
- 4,992
22
votes
Accepted
21
votes
Accepted
Your Task Is to Create the World's Hardest Irregular Sudoku!
The 'hardest' possible Irregular Sudoku has
and it looks like this:
- 150k
21
votes
Accepted
Complaint at the PSE lounge
The
Needs to be upgraded!
Quick explanation of how to solve (lots of pictures for step by step solutions):
Solution to the nonogram:
Steps:
1:
2:
3:
The riddle:
Now
Solving the new sudoku:
...
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20
votes
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How can I solve this sudoku?
If F1 is a 2, then
On the other hand, if F1 is not a 2, then
Therefore,
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20
votes
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Sudoku NYT medium difficulty
Stiv's answer is right (+1), but let me share another technique which might help you discover this in the future.
- 28.1k
20
votes
Accepted
PSE Advent Calendar 2021 (Day 20): Candy Cane Sudoku
Before we start solving, there's a few logical deductions we can make at the very start:
So with this basic information, we can start trying to narrow down the candidates, and hopefully placing some ...
- 62.8k
Only top scored, non community-wiki answers of a minimum length are eligible