WPF Sudoku Grand Prix 2015 Round 4 by Jan Mrozowski

The author of the World Puzzle Federation (WPF) Sudoku Grand Prix 2015 Round 4 is Jan Mrozowski from Poland. This championship will be held from 27th March, 2015 to 20th March, 2015 online at the WPF Sudoku website. The previous round 3 of the WPF Sudoku Grand Prix was authored by Indian puzzle creators, in which I was one of the co-authors for the test.

There are many interesting puzzles in this championship, with a few puzzles being the new Sudoku Variations, e.g., Between Sudoku and Sukaku Sudoku. In fact, Sudoku already appeared in the recent World Sudoku Championship 2014 with slight rules changes. I have also prepared a Between Sudoku. The difference between the current version of Sudoku are previous one is that currently, between numbers appear in all the given digits, whereas in the previous version of this Sudoku, numbers with such a property were marked with circles and lines connecting these circles. It means that in the previous version, even on some of the diagonals are rules of Between Sudoku can be applied, but in the current version, these rules only apply to Rows and Columns.

This championship contains the following Sudoku variations. I am posting the links to the practice puzzles for these Sudoku variations. Be aware that some of these practice puzzles contain additional rules.

1. Classic Sudoku

2. Windoku,

3. No Touch Sudoku

4. Irregular Sudoku

5. Diagonal Sudoku

6. Roman Numeral Sudoku

7. Between Sudoku and

8. Sukaku Sudoku

I am enjoying participating in the WPF Sudoku Grand Prix. Looking forward to this championship over the coming weekend.