The New Sudoku Players' Forum

[snowbear]

I am learning how to create my own sudoku puzzle at :

http://www.pro.or.jp/~fuji/sudoku/makesudoku/sudoku01.html.en


Is there any other place where I can learn more on how to manually create my own sudoku?

Thanks

[Pi]

I do it by first creating a finished puzzle, this is easier that it sounds if you work on one 3X3 box at a time, i then remove 1 number from each row, collum and mini grid.

Next i remove any numbers which i can see could be filled again using remaining clues.

This tends to lead to the easier puzzles though

[snowbear]

Hi Pi,

What you explains sound interesting. Could you, when you have spare time, include a short example so that we can understand better? eg, Give an example doing the top 3 boxes ?

Do we say remove 1 from box 1, 2 from box 2 etc? Or is there a pattern we have to follow?

Thanks

SNowBeAR

[Pi]

Start with

Code: Select all

|534|
|679
|182|


in the top left

this builds up to

Code: Select all


|534|---|---|
|679|---|---|
|182|---|---|
|---|---|---|
|---|---|---|
|---|---|---|
|748|---|---|
|356|---|---|
|291|---|---|


and then

Code: Select all

|534|---|---|
|679|---|---|
|182|---|---|
|463|---|---|
|815|---|---|
|927|---|---|
|748|---|---|
|356|---|---|
|291|---|---|


then

Code: Select all

|534|267|---|
|679|318|---|
|182|459|---|
|463|---|---|
|815|---|---|
|927|---|---|
|748|---|---|
|356|---|---|
|291|---|---|


then

Code: Select all

|534|267|981|
|679|318|425|
|182|459|376|
|463|---|---|
|815|---|---|
|927|---|---|
|748|---|---|
|356|---|---|
|291|---|---|


then

Code: Select all

|534|267|981|
|679|318|425|
|182|459|376|
|463|572|---|
|815|693|---|
|927|184|---|
|748|---|---|
|356|---|---|
|291|---|---|


After this i guess a few numbers and then it all falls into place using solving techniques.

It ends up as this

Code: Select all

|534|267|981|
|679|318|425|
|182|459|376|
|463|572|819|
|815|693|247|
|927|184|563|
|748|936|152|
|356|821|794|
|291|745|638|


That is how i make a completed puzzle.

before you get a completed grid you will probably come to a dead end where you can't finish it, if this happens remove a few numbers (such as the top three rows) and continue from there

by removing some of the candidates i can make puzzles like these

Code: Select all

|-3-|---|9-1|
|-7-|3-8|4--|
|1--|45-|---|
|46-|5-2|81-|
|--5|-9-|2--|
|-27|1-4|-63|
|---|-36|--2|
|--6|8-1|-9-|
|2-1|---|-3-|

Rating=5


Code: Select all

|534|---|98-|
|-7-|3--|42-|
|-8-|4--|-76|
|4--|5-2|---|
|815|-9-|247|
|---|1-4|--3|
|74-|--6|-5-|
|-56|--1|---|
|-91|---|638|
Rating =3



[snowbear]

This is a very interesting way of creating a puzzle.

After completing the puzzle, how do we know what number to remove from say Box 1, Box 2 etc?

Example,
in rating=5,

Box 1, you remove 5
Box 2 you keep 5

but in rating=3,

Box 1 you keep 5
Box 2 you remove 5


BTW, what does the rating mean? Does rating = 5 means very hard puzzle?

[Pi]

Ok, i'm sorry i cheated, i didn't have much time yesterday and so my computer made that puzzle, however the computer does it pretty much the same way.

The rating of those puzzles are quite easy, i thing that 5 is roughly equal to a pappocom easy and 3 is roughly equal to a pappocom v.easy.

I will show you how i made the puzzle in a couple of minutes but i am quite busy right now