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Sudoku Xtra, written by Dr Gareth Moore
Sudoku Xtra 24
logic puzzle compendium
Printed puzzles from Dr Gareth Moore

Sudoku
 
Hanjie
 
Kakuro
 
Futoshiki
 
Calcudoku
 
Hitori
 
Killer Sudoku
 
Nurikabe
 
Slitherlink
 
Skyscraper

Sudoku-X
 
Jigsaw Sudoku
 
Consecutive Sudoku
 
Kropki Sudoku
 
Sudoku XV
 
Oddpair Sudoku
 
Toroidal Sudoku
 
Killer Sudoku-X
 
Killer Sudoku
Pro

 
Jigsaw Killer
Sudoku

Looking for puzzles for your book, magazine or newspaper?
 

 

Kropki Sudoku puzzles and instructions


Play free Kropki Sudoku puzzles:
Kropki Sudoku   16th Aug
  Kropki Sudoku-6 169 
Kropki Sudoku   8th Aug
  Kropki Sudoku-6 166 
Kropki Sudoku   4th Jun
  Kropki Sudoku-6 150 
Kropki Sudoku   24th Mar
  Kropki Sudoku-6 135 
Kropki Sudoku puzzles add extra constraints to regular Sudoku, labelling all pairs of neighbouring squares which contain values where one is either twice the other or has a numerical difference of 1.

How to solve Kropki Sudoku puzzles
A Kropki Sudoku puzzle consists of a standard Sudoku grid with the addition of either black or white circular markers between neighbouring pairs of squares. Black circles show all adjacent pairs of squares where the value in one square is double the other, while white circles show all pairs where one value is consecutive to the other. 'Consecutive' means that the numbers in the two squares have a numerical difference of '1'. For example: 2 and 3 are consecutive, as are 6 and 5.

So, to solve Kropki Sudoku you must place 1 to 9, or 1 to whatever the size of the puzzle is, once each into every row, column and bold-lined rectangle while also obeying the circular markers.

What's really important to note is that all circular markers are given, so if there is no marker between two squares then they are not consecutive and one is not double the other.

When 1 and 2 are in adjacent squares then either a white circle or a black circle will be given (since both are true).

Kropki Sudoku exampleLook at the top row of the solved puzzle on the left. The 1 is neither consecutive to the 6 nor half of it so there is no circle between the 1 and 6. The 6, however, is consecutive to the 5 which is consecutive to the 4 so there are white circles. The 4 is double the 2, so there is a black circle between them.

Every Kropki Sudoku puzzle only ever has one possible solution, and it can always be reached via reasonable logical deduction. In other words, guessing is never required.

Kropki Sudoku puzzles on puzzlemix appear at a wide range of sizes and difficulties. Usually they are 6x6, 8x8 or 9x9, in which case you must place 1-6, 1-8 or 1-9 once each into every row, column and bold-lined rectangle. These bold-lined rectangles are 2x3 for 6x6 puzzles, 4x2 for 8x8 puzzles and they are 3x3 for 9x9 puzzles.

Other types of puzzle
It's not just Kropki Sudoku you can solve online at puzzlemix. You can also solve logic puzzles that include these:
CalcudokuConsecutive SudokuFutoshikiHanjie
HitoriJigsaw SudokuKakuroKiller Jigsaw Sudoku
Killer SudokuKiller Sudoku ProKiller Sudoku-XNurikabe
Odd Pair SudokuSkyscraperSlitherlinkSudoku
Sudoku XVSudoku-XToroidal Sudoku

Keywords
Are you searching for help with Kropki Sudoku puzzles? Stuck on solving Kropki Sudoku? Don't know the instructions for Kropki Sudoku? Need Kropki Sudoku instructions? Want solving hints and tips for Kropki Sudoku? Then puzzlemix is the place for you to play Kropki Sudoku puzzles online.

External links

Looking for printed Kropki Sudoku puzzles? Visit Sudoku Xtra for puzzle magazines and books.

Or are you looking for a Kropki Sudoku puzzle supplier? If so then check out Any Puzzle Media, my puzzle production company.


All site contents ©Gareth Moore 2005-2017 - email gareth@puzzlemix.com - publishers please visit Any Puzzle Media