## Spider Sudoku !

For fans of Killer Sudoku, Samurai Sudoku and other variants

### Spider Sudoku !

Hello,

I have created a new variation, the Spider Sudoku !

http://spidersudoku.com for more puzzles!

Contact : contact@spidersudoku.com

Spidersudoku.com in English
Last edited by spidersudoku on Tue Nov 14, 2006 3:45 pm, edited 1 time in total.
spidersudoku

Posts: 8
Joined: 29 June 2006

You might want to put in a little in the way of instructions for the english speaking amongst us.

Luna
Moderator
lunababy_moonchild

Posts: 659
Joined: 23 March 2005

### Rule

The grid of Spider Sudoku is made up of:

______9 columns_____________________9 lines_______________________9 boxes

Every column, line, and box contains the digits 1 through 9.

What do you think about the Spider Sudoku?
spidersudoku

Posts: 8
Joined: 29 June 2006

spidersudoku

Posts: 8
Joined: 29 June 2006

There are 9 rows, 9 columns and 9 3x3 boxes, so basically you have a vanilla sudoku.

The only difference is that the whole picture is warped, leaving you with a few cells that can hardly contain a number, let alone pencilmarks, and other cells with way too much space.

Your sample puzzle can also be shown as:

Code: Select all
`1 . .|. . 5|. . 3. 8 9|6 4 .|1 . .5 . .|. . 1|. . 9-----+-----+-----. . 6|. 5 .|4 . .7 9 .|4 3 .|. 5 6. 4 .|. . 6|. 9 .-----+-----+-----. 3 .|. . 7|. 8 .6 5 .|3 8 .|. 1 2. . 8|. 9 .|3 . .`

Actually, this is a very easy sudoku. No fun at all.

Conclusion: Looks nice, but this is not really a new variant.

Ruud
Ruud

Posts: 664
Joined: 28 October 2005

Ruud wrote:Conclusion: Looks nice, but this is not really a new variant.

I noticed that it's virtually the same as vanilla sudoku too...

The only exception is that if we add the "diagonal" constraint than it could be applied in 18 "lines" (spirals?) instead of the normal 2 in "sudoku X", i.e. all the "broken diagonals" are now easier to see... Similar to a "cylindrical sudoku"...

PS: Just recalled that last year dukuso or Condor had proved that there is no valid sudoku grid with all 18 broken diagonals... perhaps with 1 particular direction of 9?

PS2: Oh yeah... If applied to cylindrical jigsaw or killer puzzles the nonets/cages are easier to present... But as we've seen the inner cells are too small... Perhaps if we put a "hole" in the middle and make it a ring instead of a solid circle/nonagon?
udosuk

Posts: 2698
Joined: 17 July 2005

Yes, basically it's just a regular sudoku using polar coordinates (r,theta) instead of rectangular coordinates (x,y). Besides this, the logic is excacly the same as the regular sudoku.

Now, using your idea, you may find some real new variant. Maybe with fewer cells near the center and more in the outer rings.
Jean-Christophe

Posts: 149
Joined: 22 January 2006

New Spider Sudoku with a little more originality!

________6 spirals__________________6 hexagons__________________6 boxes

Every spiral, hexagon, and box contains the digits 1 through 6.

The 6 spirals are represented by the colors, there are 2 green spirals, 2 yellows and 2 reds.

spidersudoku

Posts: 8
Joined: 29 June 2006

The variant is not new. I saw links in sudoku forums to a page in France with this type. But I can't neither remember the adress nor the forum where it was.

By the way a nice outfit for cylindrical sudoku like my cylindrical stairstep or other ones.

Pyrrhon
Pyrrhon

Posts: 240
Joined: 26 April 2006

It is normal that you saw this variant on a French forum because it is me which posted it.

I post on e-sudoku.fr forum for French and sudoku.com forum for the whole world.

Spider Sudoku on e-sudoku.fr forum
spidersudoku

Posts: 8
Joined: 29 June 2006

No it wasn't a french forum but only a link to a french page. The name was another one, but I can't remember which. They had more colored there grids and also other numbers of corners. I remember that I tested this variant and have stopped seeing that it is old wine (vanilla sudoku) in a new bottle (german saying: "alter Wein in einem neuen Schlauch").

By the way. similar variants are also named circular sudoku.

Pyrrhon
Pyrrhon

Posts: 240
Joined: 26 April 2006

I sought but I did not find anything which resembles Spider Sudoku...
spidersudoku

Posts: 8
Joined: 29 June 2006

If you want to play Spider Sudoku go on spidersudoku.com!

easy grid

medium grid

hard grid

and to print, click on the link on the bottom of the grid.
spidersudoku

Posts: 8
Joined: 29 June 2006

It seems the 6-spiral one doesn't have a unique solution?

I found 4:
Code: Select all
` 2          4  1        2   6      2    3    2     4  2      13363116  256545      54     3  6    5    4   1      4  5        3 1          6 1          4  1        2   6      2    3    2     4  5      13263116  226145      54     3  6    5    4   5      4  3        5 3          6 2          1  4        2   6      2    3    2     1  2      13463146  256415      54     3  6    5    4   1      5  3        5 3          6 2          1  4        2   6      2    3    2     1  2      13363146  256515      54     3  6    5    4   1      4  5        3 4          6`

BTW it's isomorphic to the following 3x2 vanilla sudoku:
Code: Select all
` . . | . . | 1 3  6 . | . . | . .  . 1 | . . | . 4 -----+-----+----- 3 . | 2 . | . .  . 2 | . . | . .  . . | 6 . | . . `

Which you could work to this stage and then 4 solutions emerge:
Code: Select all
` 2   4   | 5   6   | 1   3    6   3   | 14  14  | 25  25   5   1   | 3   2   | 6   4   ---------+---------+--------- 3   6   | 2   145 | 45  15   14  2   | 14  35  | 35  6    14  5   | 6   134 | 234 12   2 4 | 5 6 | 1 3  6 3 | 1 4 | 2 5  5 1 | 3 2 | 6 4 -----+-----+----- 3 6 | 2 5 | 4 1  1 2 | 4 3 | 5 6  4 5 | 6 1 | 3 2  2 4 | 5 6 | 1 3  6 3 | 1 4 | 5 2  5 1 | 3 2 | 6 4 -----+-----+----- 3 6 | 2 1 | 4 5  1 2 | 4 5 | 3 6  4 5 | 6 3 | 2 1  2 4 | 5 6 | 1 3  6 3 | 4 1 | 2 5  5 1 | 3 2 | 6 4 -----+-----+----- 3 6 | 2 4 | 5 1  4 2 | 1 5 | 3 6  1 5 | 6 3 | 4 2  2 4 | 5 6 | 1 3  6 3 | 4 1 | 2 5  5 1 | 3 2 | 6 4 -----+-----+----- 3 6 | 2 5 | 4 1  4 2 | 1 3 | 5 6  1 5 | 6 4 | 3 2 `

I regard having a unique solution as a basic requirement for a decent puzzle... Probably just me...
udosuk

Posts: 2698
Joined: 17 July 2005

Frankly, all 3 of your sample puzzles are very easy (solved by hidden/naked singles) and the one you rated as "hard" (difficile) is in fact the easiest among them to me... (And they're nothing different to normal sudoku except appearance, which has been stated by many before...)

I seriously suggest you to make use of this shape for something special like the cylindrical sudokus (see this and this)... Also I think you better design some puzzles which look symmetrical in your layout instead of just copying some puzzles which are symmetrical in the 9x9 square layout...

Here're your 3 sample puzzles in the 9x9 square layout:
Code: Select all
`8.....6...37.65.....59.4....76.1.5..91.....87..2.9.41....1.93.....47.82...9.....1.7......81..39.....3.4.6.5.89.2.......7.1.4.......4.26.2.6.1.8.....45..16......7...2.......96.1..3....49..67...3.58...85...17...47.1...42..58....1..7.39.......4..`
udosuk

Posts: 2698
Joined: 17 July 2005

Next