## Sudoku Arrow

For fans of Killer Sudoku, Samurai Sudoku and other variants

### Sudoku Arrow

Numbers in each arrow must be strictly increasing in the direction of the arrow.

In other words, if number "X" appears in an arrow, the numbers appearing after "X", must be greater than "X"; similarly
the numbers appearing before "X", must be smaller than "X".

You can construct a lot of rules, for examples number "9" cannot appear in the middle or beginning of
an arrow and number "1" cannot appear in the middle or the end of an arrow.

Here some youtube videos explaining it:

SudokuArrow.png (11.16 KiB) Viewed 311 times

Posts: 75
Joined: 31 July 2019

### Re: Sudoku Arrow

this is the same concept as greater than/less than sudoku, where the less than symbols are your arrows pointing from one cell to the next one in the arrow. it's been around for a long time

also i think your puzzle has 3 solutions
Code: Select all
`238176594649...713751349826974..1638586793241123684957497.1.362865432179312967485`
Once upon a time I was a teenager who was active on here 2007-2011
ocean and eleven should have paired up to make a sudoku-solving duo called Ocean's Eleven
Pat wrote:prenyast
999_Springs

Posts: 525
Joined: 27 January 2007
Location: In the toilet, flushing down springs, one by one.

### Re: Sudoku Arrow

Yes, it is the same concept as greater than/less than sudoku, it's just a bit more elegant
And I need to fix my algorithms to have a unique solution

Posts: 75
Joined: 31 July 2019

### Re: Sudoku Arrow

In the world of competitive Sudoku, this variant is known as Thermo Sudoku, or Thermometer Sudoku.

You will find lots of examples by searching for those terms. For example https://www.gmpuzzles.com/blog/category ... mo-sudoku/ for starters.
SCLT

Posts: 158
Joined: 06 August 2013

### Re: Sudoku Arrow

This is a bit confusing because Arrow Sudoku and Thermo Sudoku are well-known variants that often appear in competitions, and what you are defining here is basically a Thermo Sudoku, as SCLT already said.
Wecoc

Posts: 72
Joined: 08 April 2019
Location: Girona, Catalonia