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Sudoku

Sudoku is a number-placement game. The object is to fill out the nine-by-nine grids with numbers that do not repeat on both the row and column of the grid.

119 Questions

What is the maximum possible number of givens in a standard 9X9 Sudoku grid that does not render a unique solution?

A Sudoku can have a non-unique solution with only 4 empty cells. Here's an example:

003496758

587132469

694875213

008763945

946581327

375924186

761259834

852347691

439618572

If the first 2 cells are filled with 1,2 the 2 in row 4 must be 2,1, and vice-versa.

So there can be up to 77 givens in a 9x9 sudoku without a unique solution.

Is there a solution for sudoku?

Well, there is a pattern to all of them... only one of each number in each column and in each row, and in each of the nine subareas. That's how you figure them out, by evaluating what could go in each square until you have it narrowed down and can be sure that only one number fits in a certain place... then you look for another, because hopefully that new number helped you narrow things down further, etc.

Which part of the brain is affected when playing sudoku?

Undoubtedly the logic center. When people become skillful enough to start finishing Sudoku puzzles, they have a markedly improved logical deduction capacity for normal, everyday events. This is tremendously useful in discarding impossible remarks and theories.

What should be an ideal timing to participate in a Sudoku competition if its a hard or medium difficulty level.?

The Guiness World Record for an easy game of Sudoku is 2 minutes 8.3 seconds. An ideal timing to participate in a Sudoku competition on hard or medium would be higher then that due to difficulty level.

Kind of sudoku that has an inequalities?

There are at least two sudoku variants that use inequalities. One is greater-than sudoku, in which there are traditionally no given numbers and less-than and greater-than symbols are placed between cells. Another more obscure variant is greater-than killer sudoku, in which inequalities are placed between groups of numbers, indicating that the sum of one group is greater than the sum of another. killersudokuonline.com is a great place to find both of these.

Is the word sudoku copyrighted?

Yes, of course Sudoku is copywritten. If it wasn't then people could go and steal it. If you don't believe me, you can go to Google and look it up. ( yes, Google is copywritten too!)

What is the goal of a sudoku puzzle besides winning?

The goal of a Sudoku puzzle is to have one of each numbers 1-9 in each row, column, and 9 x 9 box on the grid. There are other variations but this is the most common setup.

Should you ever have to guess in sudoku?

No, you are supposed to use logic deduction to come up with the answers.

It can seem impossible at times, but a sudoku should always be solvable using logic reasoning.

Though a puzzle SHOULD be solvable using this technique , it is not always possible in more advanced puzzles. The most difficult levels require you to assume that a box is filled with one number or another. You pick one of the numbers, and then, you must follow the puzzle until you either solve it, or come to a impossible situation. Using the logical reasoning of "reductio ad absurdum", you then conclude that the number you picked WASN'T the correct number and start over from that junction point.

Is there any tournament for sudoku?

There is a World Sudoku Championship held every year since 2006. It is run by the World Puzzle Federation, and more info can be found in the related links.

Given a Sudoku puzzle with only one right answer is it always possible to solve it without using trail and error?

Not always. There is a practically infinite number of grids that cannot be solved using even the most advanced techniques, including some that blur the line between logic and trial and error. A software and puzzle designer known as Ruud has compiled a list of 50,000 such puzzles, which can be found here: http://www.sudokuvault.com/top50000.zip Unfortunately, nearly all sudoku puzzles found in American publications are computer generated, so there is no guarantee you won't come across puzzles that cannot be solved logically, but a majority of them still can.

What is the importance of Sudoku?

It's actually a very helpful game for the brain

it makes the brain think and work to really make sudoku useful play a race with your friends to who finishes the sudoku first

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It appears you've entered a long string of "w" characters, which doesn't form a coherent question. If you meant to ask something specific or have a topic in mind, please clarify, and I'll be happy to assist you!

Where can one play sudoku on USA today?

Sudoku puzzle collections are published as books and are also printed in some newspapers and magazines. Sudoku puzzles can be found online (try a simple "sudoku" search) and are available for download on many mobile devices.

Who is the inventor of sudoku?

i hate you you stupid bad dum moron ha does that answer your quesition?

What does naked singles mean in sudoku?

A Naked Single is a case where a cell has only 1 possible value.

The name comes from analogy with Naked Pairs, Triples etc. A Naked Pair is when two cells A and B of some group - a row, column, or box - have the same two possible values. Whichever way those 2 values are assigned to cells A and B, they are not available to fill any of the other cells, so they can be removed as possibilities from the rest of the group. The "naked" indicates there are no other possibilities but the pair. Naked Triples, Quads, etc. work similarly. By extension downward, a single cell with a single possibility is a naked single.