Logic Masters Deutschland e.V.

This puzzle is a variant of a Standard Sudoku.
rule:

1. Standard Sudoku rules apply;

2.The solver should choose n numbers from 1~9 to fill the n×n regions marked by blue.(Latin Square)

CTC link. Have fun solving!

The CTC link can't show the blue regions, sorry about that. But I create the link with solution check. I hope everyone like it.

Your feedback and comments are highly appreciated :) Enjoy !