Donaukurier Sudoku 07/14/2021

For winning 25€ in the Sudoku of our newspaper Donaukurier there is a chance up to midnight. ;-)

I've optimized my rsudoku application to be as fast as 0.006 seconds to solve the Donaukurier Sudoku from the last post.

Resolved Donaukurier Sudoku July 14th 2021