solve sudoku without even thinking

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Solve Sudoku (Without even thinking!) by delgaudm

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This instructable provides step by step instructions to complete a Sudoku puzzle by

simple process of elimination.

One of the things I that drove me crazy about Sudoku is how difficult it is to return

to a puzzle if you get interupted. This system allows you to walk away from a puzzle

at any time and return exactly where you left off.

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Step 1: What you need to begin

Related

Make your own "free"

Sudoku books

by mrmath

How to make a 3 piece

puzzle impossible tosolve

by atk000

Color-Based Wooden

Sudoku Board

by thegnome54

Erasable Sudoku game

for vision-impaired/DIYWhiteboard
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You need:

1. A sudoku puzzle. I enlarged this one (which was the puzzle that appeared on

Sudoku.com on July 8, 2006.) to make photography easier. I find this system

works better on larger puzzles.

2. A pencil, Not a pen. A pencil.

3. An eraser.

See More

by hoodsmom

Sudoku:solving it for

beginners and the

expirienced

by Oorspronklikheid
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Step 2: Fill in the "Missing Grid"

You see, a Sudoku puzzle is missing a grid. Once you put in this grid, it is sooo

much easier.
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Enter the numbers 1 through 9 in a "tic-tac-toe" pattern in every blank box.

Step 3: Erase "Across"
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Now, for that same number "6", erase the corresponding "6"'s in every box in the

same column. Once you have completed erasing, draw a line down the edge of thenumber to indicate that you have completed this step.

Step 5: Erase "All Around"
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Ok, last step for the first number "6" Erase all the "6"s in the same quadrant. Thendraw a circle around the number to indicate you have completed this step.

Now you have eliminated all the sixes from all the other blocks. That indicates that a

Six canot appear in any of those blocks.

Keep going, repeat those same three steps for all the other pre-printed numbers in

the puzzle.
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11 months ago Reply

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chocolateface

What's the point in solving a sudoku without thinking? There's no pride or

"retribution".

R6LPW

Using computer programmes to solve Sodoku seems to defeat the object oftrying to solve a puzzle or problem to exercise the brain!

Presumably 'broper's somewhat exotic spelling is not for real!

(who is Ible?)

nafango22

this doesnt work with very hard sudoku puzzles. the really tricky ones will make

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4 years ago Reply

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you randomly pick a number for a square and check to make sure it works in

that square as you fill more in.

amannuc nafango22

I have done many "genius level" Sudokus without guessing. There is no

need to guess. If you are interested, I'll put up the information on a

wordpress blog that works for me.

AnJo888 amannuc

Thank you. Please, do that.

Snowbunny

I picked up my first puzzle and applied this technique. I failed then copied thepuzzle again and took my time. Unfortunately the puzzle was labeled "gold" or

"Hard" and I still have a few squares left with a lot needing the same numbers.

Is there some sort of "next step" or should I just "hit and miss" and take the

"keep trying approach"? Any suggestions?

amannuc Snowbunny

No need to guess. If you are interested, I can provide additional clues.

AnJo888 amannuc

Thank you. Please, do that.
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flarr

whats the matter with some of you,this is the easyiest systemi have ever seen I

ust solved the outlaw level3 times with out a hitch,simple just fallw instructions

thank you

love this system

sankalpsawant

what to do when 1 to 9 numbers already exist in column & row of particular

block....

sankalpsawant

man pscovio

deau_oow

Sudoku mean a mathematics, brainstorming and calculation. you are

completely wrong if "Don't even to think" for sudoku. This is kind of joke of the

day for me. by using your above 10 step technique, only simple sudoku's could

be solved not even medium, forgot about hard, tough and evils. not even 2% of

the puzzle will be solved using these approach.

iyyanar4565

but i need quick method

R l
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kokosalexa iyyanar4565

There is no quick method. You're supposed to relax and think.

iloveswing95

If you guys have an iphone or ipod I thought Pennypop's sudoku app had a

really nice learning curve. I picked it up pretty fast and I'm not really that smart

:P. it's free too and looks way better than the other apps.

rjvkshl

I find SUDOKU to be a very refreshing and mind-invigorating game. If I solve a

puzzle with my morning cuppa tea, it helps me to clear my hangover. If I solve a

puzzle with my lunch, it helps me to dose off to a peaceful nap.

Prasamsa

same quadrant here means??how much area is considered as a quadrant??

im confused in this step..

rjvkshl Prasamsa

A square of 3x3 is a quadrant or grid. There are 9 of them in the

puzzle.

Granny Hardin Prasamsa

Prasamsa,

I'm pretty sure he just means one out of the nine "boxes" in the main

grid. I guess if "nona-" is the prefix for "nine", then he'd be talking about

a "nonadrant". LOL

I t thi b it h i t fi d t h thi ki i ddl d
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I came to this web site hoping to find out where my thinking is muddled

when I get down to the same three possible numbers in any box,

column, and/or row. I can't seem to figure out how to further eliminate

possibilities. If you - or anyone else reading this post - can help, I'll

check back!

Thanks!

Granny H

PurpleKat Granny Hardin

You shouldn't end up with a solution where there are only three boxes

left, and you have the same three numbers for each of them. In that

case, it seems like you could allocate the numbers as you please, as

any will be a "right" answer.

If you just have a place where you have the same three numbers

appearing in the same box, column, and row, but there are other bits

left to solve as well, try to work on other parts of the puzzle. Somewhere

in the puzzle, there's some way to eliminate some of those numbers.

You might wind up coming at it from a really backward direction, but it's

there.

Granny Hardin PurpleKat

Thank you for trying to help, PurpleKat.

I think I stated my problem poorly. Let's see ... What I meant was more

like what you say in your second paragraph. When I have several

"other bits" of the puzzle left here and there, and the same two or three

numbers are the only ones available for all of those little boxes, I don't

know how to eliminate without guessing. And guessing NEVER works

for me! I'll come back again when I bump into a good example to give

you.
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Again, thanks!

Granny H

PurpleKat Granny Hardin

If I could see a puzzle with the problem on it, I could tell you how I'd go

about solving it, assuming I knew how. I'm not a master at this -- justsomeone who loved logic problems as a kid. :)

rjvkshl

You have painstakingly described a beginner's method which I had adopted a

few years back. I prefer to 'soften up' the puzzle as much as I can, before

embarking on this method, which I have privately termed as the 'slog phase' of

solving the puzzle.

How do you soften the puzzle? Select a pattern of rows and columns which

have the highest number of digits. Proceed to tackle them in descending order

of number of digits.

Once you have selected a row or column with the highest numbers, attack it in

an oblique manner. For instance, if you are tackling the upper row, you may

find a number repeated in the sub-rows. Now try to fit that number in the 3rd

row by looking into the sub-columns.

Attack all 3 horizontal rows and 3 vertical columns turn by turn, systematically in

this manner and you would have softened up the puzzle a bit. Repeat the entire

process and you'll get a few more discoveries, maybe one or two.Once the puzzle has become soft, you can start the slog phase. It is NOW that

you need a pencil & eraser.

Don't make all entries (from 1-9) in every box. You can straightaway start with

the missing numbers ie possibi lities.

Once you have entered all possibilities, start looking for singletons - row-wise,

column-wise and grid-wise. Having caught singletons, erase the

corresponding possibilities row, column and grid wise.

Now look for pairs triads and even in a few cases 4 digit patterns Having
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2 years ago Reply

Now look for pairs, triads and even in a few cases, 4-digit patterns. Having

identified a pair, triad or a quad in a row/column/grid, proceed to erase the

numbers in the remaining possibilities.

Don't forget, once you have discovered any digit, always look obliquely in

horizontal as well as vertical directions to fit it into a suitable blank space, as I

have described in para 3 above. It helps.

Ultimately you will reach a point where all the solutions cascade into view.

bobc4012

While this approach is good for solving the simplest of Sudoku puzzles, it is

only a start on the more difficult puzzles. Once you have "captured" some of

the squares in the more difficult puzzles, you will find a number of squares

where it looks like "guess work", when it actually requires "advanced

techniques" to solve the puzzle There are techniques like "X-Wing", XY-Wing"

an even "multi-color" solutions, to name a few. The site

http://www.angusj.com/sudoku/ has an ".exe" file that can be downloaded

(free) and is useful for solving hard Sudoku puzzles (it has a decent help guide

along with googling some of the advanced solving techniques). When you get

stumped, you can click on the "hint" button and it will indicate a square and the

technique to derive the answer for that square. In certain instances, the

technique isn't always straight forward and googling will help clarify.

One thing that is the case with most Sudoku puzzles is the symmetry. You

notice the symmetry at the start and as the solution proceeds, you will notice a

symmetry in the solution. In this case, this is where I agree with Eddie Chong

on the "beauty" of the puzzle. What I detest most are those puzzles where youare reduced to guessing (rather than using logic and reasoning) which of 2 or

3 numbers to to choose in 2 or 3 squares and use "trial and error" to solve.

This is typical in most Sudoku magazines that have "extreme" or "brutal"

puzzles. To me, you should never have to resort to "trial and error" to solve the

puzzle. As Sir Arthur Conan Doyle had Sherlock holmes say "Once you

eliminate the impossible, whatever remains, no matter how improbable, must

be the truth."
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10T

It's great to see all the comments from so many dedicated puzzle solvers! I just

started Sudoku, so using this technique along with tips from other websites

really helped me to learn the methods quickly, for example, solving by pairs

and triples. Thanks for creating this website.

broper

very nice

good job on you ible but one thing i want to menchon dosint this methoud take

the fun out of sudoku? i tryed it on a hard puzzel and i didn't feel like i

completed any thing when i was fineshed.

nice way to do it but it takes the fun away

parallelchild broper

I disagree... if you used this method on truly hard puzzles, even with

"notes" (as I call them) they can be difficult. A puzzle is a problem

meant to be solved, this happens to streamline the process. Goodluck

:)

broper parallelchild

yes thats a good point but i think it makes it to easy i mean i like doing

hard puzzles and i enjoy the chalenge but if i do it the way you suggest i

think it makes it two easy

ps
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i think the methoud you made is a good one and i have nothing roung

with it

it does its job it makes sudoku easy ( :

mitchell12 broper

Try cross words, Seems like you'd have plenty of challenge with those:)

hrodriguez7 broper

you have a point

my dad is always sayin' that it has to be chalenging

broper hrodriguez7

tx ( : i think the way you do it is awsom. and smart that you came up

with it

WillyTheKid

I try to get everybody I know to play Killer Sudoku (or Sum-doku). So much

more of a challenge than even the hard level sudokus. but still there is a

system.. always a system, even if it is complex. no need to guess!

bjohnson1

You should onlyuse a pen and no eraser! That is how to do Sudoku.
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19/22

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2 years ago Reply

You should only use a pen and no eraser! That is how to do Sudoku.

siamonsez

I'm sorry, but this method feels like cheating to me, and at the very least

defeats the purpose of doing the puzzle in the first place. You can resort to this

method once the majority of the puzzle is done and you are totally stuck, but in

my experience, you only get stuck because you either missed somethingobvious, made a mistake, of are trying a puzzle above your skill level that

requires the use of techniques you are not familiar with.

Anyone that wants to learn to sudoku should avoid this technique because you

will learn nothing by finishing puzzles this way and therefor will never be able to

progress on to more challenging puzzles.

Eirinn siamonsez

I really cannot see what the difference is? The only difference i see isthat this is systematic and the other way of doing it is less systematic.

This is nott a game of memory, it is a game of systematically solving a

grid puzzle.

siamonsez Eirinn

The difference is that if you rely on this method you will never get better.Once you start doing sudoku puzzles regularly, it's not just about

completing them, but doing it quickly; anyone can finish , what makes it

fun is doing it better.

Eirinn siamonsez

The answer to this problem is not as straightforward as that :) It all

2 depends in which way one views "getting better" and "fun".
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siamonsez Eirinn

Maybe I have a bit of ADD, but once something gets monotonous, it

gets boring. So, for me, pushing myself to do better is what makes it

fun; therefore, the two are interchangeable.

vincent7520 siamonsez

right !

100% !

I'm not against cheating, but it's got be worth it. In this example we

didn't even try to begin to play sudoku : may as well play pencil and

eraser on any piece of paper.

anyway the example given is so basic that it's not even worth taking

the pain to write all those numbers down : this sudoku can nearly besolved by itself !! !

bwrussell siamonsez

This is simply a visual representation of what your thought processes

when finding the answers. The only reason it's easier is that you don't

have to remember everything you've done. Of course more advanced

puzzles will require more advanced techniques but a lot of thosetechniques are based on logical trial and error, which could be

considered cheating just as much as this method.

This is a good way to start if you are learning sudoku, eventually you

will learn the patterns and you wont need as many pencil marks.

Besides if you are just starting and need this method to solve a puzzle

there is li ttle chance that you will know or be able to use the more

advanced techniques.
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