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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Hi, everybody! I am Henry Kwok.

One of my Sudoku creations, Constellation Sudoku, was published on the British math educational NRICH website in May 2007:

http://nrich.maths.org/public/viewer.ph … part=index

The same variant was first published as one of the "Puzzles to be solved in Prague -- Good practise" for the Second World Sudoku Championship 2007 on the website

http://www.sudoku07.com/main/Puzzles.pdf

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Here is a more difficult puzzle of the same variant which I had posted on the Age of Puzzles website http://www.ageofpuzzles.com/Collections … Sudoku.htm

*Last edited by aman (2007-08-25 20:59:19)*

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Some of my Sudoku creations from the British math educational NRICH website were used in the recent Second World Sudoku Championship 2007 in Prague:

1. Ratio Sudoku

http://nrich.maths.org.uk/public/viewer … page=month index.php

2. Intersection Product Sudoku

http://nrich.maths.org.uk/public/viewer … page=month index.php

3. Intersection Sums Sudoku

http://nrich.maths.org.uk/public/viewer … page=month index.php

4. Pole Star Sudoku

http://nrich.maths.org.uk/public/viewer … page=month index.php

5. Twin Corresponding Sudokus

http://nrich.maths.org.uk/public/viewer … page=month index.php

6. Integrated Sums Sudoku

http://nrich.maths.org.uk/public/viewer … page=month index.php

7. Integrated Product Sudoku

http://nrich.maths.org.uk/public/viewer … page=month index.php

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Three other versions of my variants from the Age of Puzzles website had been used in the Second World Sudoku Championship 2007 at Prague:

8. Duplex Sums Sudoku

http://www.ageofpuzzles.com/Collections … Sudoku.htm

9. Duplex Plex Sudoku

http://www.ageofpuzzles.com/Collections … Sudoku.htm

10. Quadruple Clue Sudoku

http://www.ageofpuzzles.com/Collections … Sudoku.htm

The last variant was also used in the Italian National Sudoku Championship 2007.

Please refer to the website http://www.nonzero.it/pdf/indizi.pdf where the variant is called "sudoku a indizi" in Italian.

*Last edited by aman (2007-08-29 16:14:51)*

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**jo****Member**- Registered: 2007-08-30
- Posts: 27

Thank you for posting the links, Henry.

The puzzles are excellent and I shall certainly be printing some of them!

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Hi jo, thank you for your generous compliments.

My second Pole Star Sudoku variant (Differenzen-Sudoku in German) was published on the NRICH website http://nrich.maths.org/public/viewer.ph … part=index in August 2007.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Thank you, jo, for your kind comment.

Another Quadruple Clue Sudoku was posted on the NRICH website http://nrich.maths.org/public/viewer.ph … part=index in September 2007.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

The first difference sudoku, Duplex Difference Sudoku (Duplex-Differenzen-Sudoku in German), published in March 2006 by issue No 38 of Plus magazine http://plus.maths.org/issue38/puzzle/index.html , used more than one inequality signs as additional clues for solving the puzzle.

My latest sudoku variant, Minimal Difference Sudoku, published in October 2007 by NRICH http://nrich.maths.org/public/viewer.php?obj_id=5798 , is an improvement as it uses only a single inequality sign as additional aid for getting the solution.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

I have posted a simple form of twin equivalent Sudoku puzzles called "Twin Chute-swapping Sudoku" on the Nov 2007 NRICH website http://nrich.maths.org/public/viewer.php?obj_id=5870

Both Sudoku puzzles are essentially one and the same puzzle. Each twin can be created from the other by swapping a horizontal/vertical chute or band of blocks with another horizontal/vertical chute or band of blocks.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

I have created another simple form of twin equivalent Sudoku puzzles called "Twin Line-swapping Sudoku" for the Dec 2007 NRICH web page http://nrich.maths.org/public/viewer.ph … part=index

Both Sudoku puzzles are essentially one and the same puzzle. Each twin can be created from the other by swapping the rows/columns within a horizontal/vertical chute of three blocks.

NRICH has also created a beautiful graphic called the "Advent Calendar" on the web page http://nrich.maths.org/content/id/5905/calendar.swf for easy access to some of my past monthly Sudoku puzzles in the run-up to Christmas.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

I have created the first ever sudoku that requires an additional clue from a story for obtaining the solution to the puzzle. I have named my new sudoku variant "Story Sudoku".

I have posted it together with my fairy tale entitled "Fictusia" on Dr Sam Guo's website http://www.chinasudoku.com/

For those readers who like stories and sudoku variants, they will find something new and refreshing in "Story Sudoku".

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

My new sudoku variant, "Colour Islands Sudoku", is posted on the website http://www.ageofpuzzles.com/Collections … Sudoku.htm

The variant is based in part on the rules of my two sudoku board games "Henry's Houses" and "Pseudo-Go" that are sold on-line by Kadon Enterprise http://www.gamepuzzles.com/pseudocoup.htm

The rule of both board games: "No two pieces of the same colour (or number) may be next to each other in any direction -- horizontally, vertically or diagonally. Each piece must be next to all-different colours (or numbers), different from itself and different from each other. Every fully filled 3x3 area will contain 9 different colours (or numbers)."

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

My creation "Twin Equivalent Sudoku" is posted on the Jan 2008 NRICH website http://nrich.maths.org/public/viewer.ph … part=index

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Dear Katherine,

Thank you for your interest in my puzzles. My aim is to introduce my sudoku creations to every remote corner of the world, particularly to web users who do not surf or "travel virtually" as widely as you are in the cyberspace.

My posting in your mentioned Vietnamese forum is meant for Vietnamese who understand English while the same topic here is catered for Russians and other Eastern Europeans who know the English language.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Another new original creation of mine called "Equation Sudoku" on the NRICH website http://nrich.maths.org/public/viewer.php?obj_id=5970

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

One more original creation of mine called "LCM Sudoku" on the NRICH website http://nrich.maths.org/public/viewer.ph … part=index

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**V-Puzzle****Member**- From: Minsk
- Registered: 2008-03-09
- Posts: 22

Thank you aman for theese puzzles! I like sudoku (espessially different kinds of sudoku)

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

V-Puzzle, thank you for your compliment.

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**V-Puzzle****Member**- From: Minsk
- Registered: 2008-03-09
- Posts: 22

Have you got any new ideas? I like to make sudoku too. Two weeks ago I invented new kind of sudoku and soon I'll take it to you.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

Yes, a few new ideas. I look forward to seeing your new kind of sudoku in this forum.

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**V-Puzzle****Member**- From: Minsk
- Registered: 2008-03-09
- Posts: 22

Easy As Sudoku

Fill in the grid with numbers from 1 to 7, so that each row, column and outlined area contains numbers exactly once. Numbers outside must be placed first in corresponding rows and columns.

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**aman****Member**- From: Singapore
- Registered: 2007-08-23
- Posts: 42

The name of your puzzle reminds me of a variant in the following link http://www.sachsentext.de/en/endview_sudoku1.htm

I think you should elaborate on the rules of your puzzle and explain them more clearly – e.g. what are the crosses for? Do the rules mean that the second row has 7 numbers, 2 empty cells and a cross? Similarly, do the rules mean that the first column has 7 numbers and 3 empty cells?

According to your rules, does it mean that we have to place 7, 4 and 2 in r2c2, r2c1 and r4c9 respectively? If so, there is no need to place the numbers outside the 10x10 grid. You might as well place the numbers straight into the cells. Since the puzzle is posted in the forum, it is interesting to find out what other forum members think of the puzzle.

I also suggest that you should start a new thread for all your new ideas and puzzles.

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**Andrey Bogdanov****Administrator**- From: Moscow
- Registered: 2007-05-30
- Posts: 355
- Website

## aman wrote:

what are the crosses for?

If so, there is no need to place the numbers outside the 10x10 grid. You might as well place the numbers straight into the cells.

I'm not sure, but I think crosses mean empty cells. So each row, column and area should contain each number exactly once and three empty cells (including crosses).

"Numbers outside must be placed first in corresponding rows and columns." means that only empty cells may be between this number and the edge of the grid.

So you are not right about 2 in r4c9 is. It may be in r4c6, r4c7, r4c8 or r4c9. And the same is for other digits.

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