Logic Masters Deutschland e.V.

Few months ago I posted here the original version of this puzzle which is now still by far my hardest puzzle and also the most valuable learning moment since I started setting sudokus. The amount of both very positive and very negative feedback really made me thinking about a lot of things including if I shouldn't revisit the puzzle at some point. This revised version keeps the first half of the puzzle almost intact, but the later part is done very differently. I love both versions of the puzzle, but I also think the break-in to the puzzle deserves this somehow more friendly ending, at least in such alternative manner. Needless to say, this version is still a very hard puzzle.

Huge thanks to Samish and Piatato for their test solves and feedback on this version and as always, I will be happy to read your comments. Enjoy the puzzle!

` Rules:

-Standard irregular sudoku rules apply, the regions, however, must be deduced by the solver. Some region borders are given and must be respected.

-All regions are orthogonally connected and are numbered by distinct numbers 1-9. The number of the region corresponds to the digit in its upper left corner (the leftmost cell in the highest row).

-A cell is called friendly, if its digit matches the number of its row, column or region (or more of them simultaneously).

-A border between two regions is friendly, if at least one of its adjacent cells is friendly.

-The number in the upper left corner of the cage shows the sum of the digits in the friendly cells within the cage. Digits may not repeat within a cage.

-The clues outside the grid show the number of the friendly borders in the corresponding row or column.



penpa+ link (answer check on digits and edges)
f-puzzles link
ctc app link