I found an answer from www.quora.com

When a **sudoku puzzle** is **created**, how **can** the **creator** be **sure** it is ...

The question shows a misunderstanding of how **Sudoku puzzles** are **created**.
Ensuring **solvability** is essential **to** the process of **creating** the puzzle. In particular
...

For more information, see When a **sudoku puzzle** is **created**, how **can** the **creator** be **sure** it is ...

I found an answer from www.quora.com

How is it determined which numbers **can** be removed from a **sudoku** ...

Apr 1, 2016 **...** When a **sudoku puzzle** is **created**, how **can** the **creator** be **sure** it is **solvable**?
7,405 Views · Is every solution **to** a **sudoku puzzle** just a ...

For more information, see How is it determined which numbers **can** be removed from a **sudoku** ...

I found an answer from puzzling.stackexchange.com

Are there published **Sudoku puzzles** that require guessing ...

Choice **made** without logic = guess. ... Are there **Sudoku puzzles** that **can**'t be
solved logically? .... If by 'guessing' you mean writing down numbers that you are
not **sure** about, then no, every proper puzzle is **solvable** (in theory) .... **Sudoku**
**puzzle** means **to** get the puzzle **creator's** intended solution and there ...

For more information, see Are there published **Sudoku puzzles** that require guessing ...

I found an answer from stackoverflow.com

How **to** generate **Sudoku** boards with unique solutions - Stack ...

None of these changes **will** make a **solvable** board **unsolvable**. ... The average
number of clues for a Sudoku is about 26, and **I**'m not **sure** but if you ... Using this
method you **can create** a very easy **sudoku puzzle** with or without programming.

For more information, see How **to** generate **Sudoku** boards with unique solutions - Stack ...

I found an answer from gamedev.stackexchange.com

algorithm - How **can I** generate **Sudoku puzzles**? - Game ...

Each seed **puzzle** therefore **can create** 5,806,080 variations. .... but Im pretty **sure**,
if you **can** offer him other 17 unique solution **sudoku will** be ...

For more information, see algorithm - How **can I** generate **Sudoku puzzles**? - Game ...

I found an answer from en.wikipedia.org

**Sudoku** solving algorithms - Wikipedia

Although it has been **established** that approximately 5.96 x 11^{26} final grids exist,
a brute force algorithm **can** be a practical method **to** solve **Sudoku puzzles**.

For more information, see **Sudoku** solving algorithms - Wikipedia

I found an answer from en.wikipedia.org

P versus NP problem - Wikipedia

The P versus NP problem is a major unsolved problem in computer science. It
asks whether ... Consider **Sudoku**, a **game** where the player is given a partially
filled-in grid of ... So, **Sudoku** is in NP (quickly checkable) but **does** not seem **to**
be in P ... there are problems in NP that are harder **to** compute than **to verify**: they
**could** ...

For more information, see P versus NP problem - Wikipedia

I found an answer from www.scientificamerican.com

First "Commercial" Quantum Computer Solves **Sudoku Puzzles** ...

Feb 13, 2007 **...** Scientific American is the essential guide **to** the most awe-inspiring advances in
... or qubits, they **will** be able **to** perform **certain** tasks that are currently out of
reach. ... says Geordie Rose, D-Wave's co-**founder** and chief technology officer. ...
**creating** a complicated seating plan, and filling in **Sudoku puzzles**.

For more information, see First "Commercial" Quantum Computer Solves **Sudoku Puzzles** ...