sudokucup.com

I have prepared a new variant for you - Kropki.
This variant was in the first Sudokucup, so you could try it then - Sudokucup 1.

A clue for Kropki:

Let’s give an example of an empty circle between numbers 4 and 5. If you realize that in the puzzle there are all examples of this rule marked, you can use the rules reversed. It means that if there is a number 4 and you think about the position of the number 5, it is sure that the number 5 can be only there where there is the empty circle.

Also you have to think of all stuff that are done and can help us. You know there are two types of circles which affect positions of numbers. We can say that this is a special case of consecutive sudoku with additional rule of black circles. Consider what the rule is about and how you can use it. I believe it may be easier for you then.

I hope you'll like this puzzle,
Enjoy solving

Kodyn