Making a puzzle
9 posts
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Making a puzzle
by Chessmaster » Mon Jan 09, 2006 11:31 pm
this is not so much a puzzle i need help solving but how do you make a good sudoku puzzle. i have made some but i do not know how to make one where you are given few numbers.
- Chessmaster
- Posts: 191
- Joined: 21 December 2005
by QBasicMac » Tue Jan 10, 2006 11:34 pm
Just wondering why you want to make puzzles - there are zillions available and I think this site is sponsored by the author of a program that will give you all the puzzles you want.
Unless you are a hobby programmer. If so, what is your language? If QBasic, come to the classic forum at www.qbasic.com and get help. We have written several.
If you imagine to do it yourself with pencil and paper, I've heard very skilled Japanese experts can do that. I've heard they have 81 people on a team, each one responsible for one square. (Probably just tall tales). But I don't think it is very easy. You need to be some kind of special-gifted person.
But any programmer can write a program that will do pretty good.
Mac
Unless you are a hobby programmer. If so, what is your language? If QBasic, come to the classic forum at www.qbasic.com and get help. We have written several.
If you imagine to do it yourself with pencil and paper, I've heard very skilled Japanese experts can do that. I've heard they have 81 people on a team, each one responsible for one square. (Probably just tall tales). But I don't think it is very easy. You need to be some kind of special-gifted person.
But any programmer can write a program that will do pretty good.
Mac
- QBasicMac
- Posts: 441
- Joined: 13 July 2005
Making Puzzles
by PhatFingers » Wed Jan 11, 2006 5:52 am
I have a couple of suggestions that can get you rolling.
1. If a given puzzle has all the numbers filled in, then you can cut 3 strips off the top and paste it on the bottom, or 3 strips off the right and paste it on the left. You can also rotate or mirror-image a completed puzzle and it will still be valid. Same is true if you swap any two digits. Repeat any combination of these steps a random number of times and you've got a good starting point.
2. Given a completed puzzle, try and find two (or four) symmetrical squares that you could logically put back in place if they were removed. Repeat until you can't remove any more squares.
That ought to do it. The more creative you can become in practicing step two, the better the quality of your puzzles will be.
1. If a given puzzle has all the numbers filled in, then you can cut 3 strips off the top and paste it on the bottom, or 3 strips off the right and paste it on the left. You can also rotate or mirror-image a completed puzzle and it will still be valid. Same is true if you swap any two digits. Repeat any combination of these steps a random number of times and you've got a good starting point.
2. Given a completed puzzle, try and find two (or four) symmetrical squares that you could logically put back in place if they were removed. Repeat until you can't remove any more squares.
That ought to do it. The more creative you can become in practicing step two, the better the quality of your puzzles will be.
- PhatFingers
- Posts: 10
- Joined: 12 September 2005
by Wolfgang » Wed Jan 11, 2006 4:07 pm
Maybe this can help you:
http://www.pro.or.jp/%7Efuji/sudoku/makesudoku/sudoku01.html.en
http://www.pro.or.jp/%7Efuji/sudoku/makesudoku/sudoku01.html.en
- Wolfgang
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- Joined: 22 June 2005
by Wer ist das? » Wed Jan 11, 2006 11:50 pm
1.Ever solve horryzontally.
2. Look at all the numbers in the 9x9 su.do.ku..
3.Be patient
4. and good luck :!:
2. Look at all the numbers in the 9x9 su.do.ku..
3.Be patient
4. and good luck :!:
- Wer ist das?
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- Joined: 11 January 2006
by Javier Cia » Fri Jan 20, 2006 8:15 pm
Get a completed/solved sudoku.
Take the nine digits (first line) in the solved sudoku
1 2 3 4 5 6 7 8 9
9 8 7 6 5 4 3 2 1
and substitute them for digits in second line.
Each 1 will be 9; 2 will be 8 and so on.
When every digit has been substituted you will have a new sudoku.
Change the second line to read
2 3 4 5 6 7 8 9 1
and you will have another possibility... and again, and again...
Javier
Take the nine digits (first line) in the solved sudoku
1 2 3 4 5 6 7 8 9
9 8 7 6 5 4 3 2 1
and substitute them for digits in second line.
Each 1 will be 9; 2 will be 8 and so on.
When every digit has been substituted you will have a new sudoku.
Change the second line to read
2 3 4 5 6 7 8 9 1
and you will have another possibility... and again, and again...
Javier
- Javier Cia
- Posts: 10
- Joined: 02 January 2006
9 posts
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