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77 votes
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This new puzzle type needs a name

Answer Solving
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  • 1,131
44 votes

Who am I??? Wait, isn't this a sudoku?

Partial solution
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  • 9,542
44 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:
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38 votes
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Empty sudoku puzzle

The solution is: or, in text form: Explanation (not the fastest way, I realized some improvements while writing it):
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37 votes
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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). ...
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36 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 ...
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  • 8,770
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 ...
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34 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: ...
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  • 8,073
34 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 ...
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34 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 ...
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33 votes
Accepted

Japanese Fusion Alphabet Soup

The completed dish The reasons why The ultimate message Follow the directions My answer
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  • 139k
31 votes

Sudoku net that is always solvable

Building off of Kevin's answer, I can get it to 33: ...
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  • 2,127
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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  • 15.1k
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:
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  • 10.3k
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 ...
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26 votes
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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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25 votes
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Techniques to Solve this Sudoku Puzzle

I'll just state some sudoku solving strategies in general, so not for the sudoku posted by you in particular. (NOTE: You probably know the first few, but I just state all of them for completeness.) 1. ...
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25 votes
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What if I told you that guessing in Sudoku is very bad and might give you a bad karma?

You're
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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 ...
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  • 40.2k
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:
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  • 21.4k
24 votes
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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 ...
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23 votes
Accepted

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 ...
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  • 5,079
22 votes
Accepted

Sudoku net that is always solvable

I believe Spencerkatty's solution is maximal... Any net may be constructed by choosing which of the 81 cells to mask. There are $\sum_{k=0}^{81}{81\choose k}=2^{81}$ ways to construct a net. Rather ...
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22 votes
Accepted

There is a reason sudoku uses squares

There is a unique solution to the following The solution is Proof of uniqueness
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  • 124k
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 ...
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  • 4,952
21 votes
Accepted

Write digits 1 to 9 in the table, each pointing to next 3x3 grid

It is not possible. Any solution to this puzzle must also be a solution to the 9x9 Queens puzzle. Luckily, that is a well-known puzzle. It has 352 solutions, but due to symmetry, those 352 solutions ...
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  • 7,300
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
Accepted

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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  • 69.3k
20 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 ...
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  • 101k
20 votes
Accepted

Your Task Is to Create the World's Hardest Irregular Sudoku!

The 'hardest' possible Irregular Sudoku has and it looks like this:
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  • 139k

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