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PostPosted: Fri Apr 03, 2020 8:53 am 
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Grand Master
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Joined: Wed Apr 30, 2008 9:45 pm
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Location: Saudi Arabia
Sindoku 23 and 23 NC

Has anyone tried any of these puzzles? If so please let me know what you think of them.


David called it Isolated Sudoku; but if you abbreviate it to Isodoku, this has been used by Motris for Isometric Sudoku. Hence we can alternatively call it Singleton Sudoku and abbreviate it to Sindoku which is not used. If you google it you get tsundoku: buying books and letting them pile up without reading them. Note I have a bookcase full which is only there for when my Kindle dies and I do not have electricity (an everyday occurrence here in Nigeria).

Given that like most of you, I am locked in at home; I have decided to post regular Sindokus here and on the Player's Forum. So the rules again:

A singleton is a number with no adjacent numbers in the four cells.

Each square gives clues about the singletons in the four adjacent cells:
1. If there is no square then no clue is given.
2. A red square means there are four consecutive numbers.
3. A blue square contains four singletons.
4. A pink square contains two doublets e.g. XY and AB.
5. A square with a single number means the other three numbers are consecutive.
6. A square with two numbers means the other two numbers are consecutive.

I will give all the coloured squares. This means some may be redundant. I have not used this fact in my own solution for this puzzle; however, I have used this extensively in later puzzles.

In most cases I use some form of NC in creating the puzzle solution, as it makes for better patterns and it allows me to make two puzzles i.e. with and without NC.

If you want a third easier version you can of course use NC with all the plain clues - I do this for my bedtime puzzle


Sindoku 23

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Sindoku 23 NC

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Last edited by HATMAN on Mon Jul 06, 2020 6:01 pm, edited 5 times in total.

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PostPosted: Mon Apr 06, 2020 3:35 pm 
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Grand Master
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Location: Saudi Arabia
Sindoku 24

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The original diagram for Sindoku 24 seems to be incorrect. If you want to try that puzzle, see Andrew's post on the second page of this thread.


Sindoku 24 NC

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PostPosted: Tue Apr 07, 2020 5:44 pm 
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Grand Master
Grand Master

Joined: Wed Apr 30, 2008 9:45 pm
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Location: Saudi Arabia
Sindoku 25 W

If you aren't familiar with Windoku Sudokus please see Andrew's Windokus post in the Killer Techniques forum.
It has a coloured diagram showing the 4 basic windows and that there are also 5 hidden windows. Each of these windows must contain 1-9.


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Sindoku 25 W FNC

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PostPosted: Wed Apr 08, 2020 8:44 pm 
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Grand Master
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Location: Saudi Arabia
Sindoku 26 X

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Sindoku 26 X NC

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PostPosted: Fri Apr 10, 2020 11:17 am 
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Grand Master
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Location: Saudi Arabia
Sindoku 27 X

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Sindoku 27 X NC

This is the hardest Sindoku I've put together. When I first solved it I had a neat move that I found in the plain one and used, but I could not remember it yesterday and have had to solve it somewhat brute force.

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PostPosted: Wed Apr 15, 2020 12:31 pm 
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Grand Master
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Location: Saudi Arabia
Sindoku 28 X

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Sindoku 28 X NC

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PostPosted: Mon Apr 27, 2020 4:30 pm 
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Grand Master
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Sindoku 29

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Sindoku 29 kNNC
It is kNight non-consecutive.

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PostPosted: Sat May 23, 2020 8:14 pm 
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Grand Master
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Joined: Wed Apr 30, 2008 9:45 pm
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Location: Saudi Arabia
Apologies for a bit of a gap in posting.
Has anyone done any of these puzzles?
Does anyone have any views about them?

Both have double diagonals so no repeats but there is a number missing on each one.


Sindoku dd NC 30

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Sindoku dd 30

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PostPosted: Thu Jun 11, 2020 8:49 pm 
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Grand Master
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Location: Saudi Arabia
Sindoku X 40 and Sindoku X NC 40

These are X.

I have used the non-clues extensively.


Sindoku X 40

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Sindoku NC X 40

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PostPosted: Mon Jul 06, 2020 5:58 pm 
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Grand Master
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Location: Saudi Arabia
SinDoku 44 Snakes and Old Lace FNC

There are only four solutions to this format, which is one solution with horizontal and vertical symmetry. It is also killer symmetrical 1 opposite 9 etc.

This is my last post for a while as there appears to be little interest.

This one is for Andrew as I remember that he liked snakes and old lace.

Sin S&OL 44 FNC

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Sin S&OL 44

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