For fans of Killer Sudoku, Samurai Sudoku and other variants

Sindoku 23 and 23 NC

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 daily Sindokus here and on the Assassin site. 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.
7. Where the square covers two or more nonets there are no repeats.

I will give all the coloured squares. This means some may be redundant. However I have not initially used this fact in my own solution.

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

Sindoku 23 NC

Last edited by HATMAN on Mon Jul 06, 2020 6:02 pm, edited 4 times in total.
HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria

### Re: Daily Sindoku (Quadrata's Concept)

Sindoku 24

Sindoku 24 NC

HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria

### Re: Daily Sindoku (Quadrata's Concept)

Sindoku 25 W

Sindoku 25 W FNC

HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria

### Re: Daily Sindoku (Quadrata's Concept)

Sindoku 26 X

Sindoku 26 X NC

HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria

### Re: Daily Sindoku (Quadrata's Concept)

Sindoku 27 X

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.

I have now solved this acceptably, I used the empty corners within a nonet which have to be two singletons and a running pair.

Last edited by HATMAN on Mon Apr 20, 2020 5:22 pm, edited 1 time in total.
HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria

### Re: Almost Daily Sindoku (Quadrata's Concept)

Sindoku 28 X

Sindoku 28 X NC

HATMAN

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Joined: 25 February 2006
Location: Nigeria

### Re: Almost Daily Sindoku (Quadrata's Concept)

Sindoku 29

Sindoku 29 kNNC
It is kNight non-consecutive.

HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria

### Re: Almost Daily Sindoku (Quadrata's Concept)

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

Sindoku dd 30

HATMAN

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Joined: 25 February 2006
Location: Nigeria

### Re: Almost Daily Sindoku (Quadrata's Concept)

Sindoku X 40 and Sindoku X NC 40

These are X.

I have used the non-clues extensively.

Sindoku X 40

Sindoku NC X 40

HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria

### Re: Almost Daily Sindoku (Quadrata's Concept)

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 of these as there appears to be little interest. I will continue to post them occasionally on the killer site.

Sin S&OL 44 FNC

Sin S&OL 44

HATMAN

Posts: 271
Joined: 25 February 2006
Location: Nigeria