Logic Masters Deutschland e.V.

Normal sudoku rules apply. Each 2x2 box in a grid has contain low digit {1,2,3}, middle digit {4,5,6} and high digit {7,8,9}.

SudokuPad link

This is the thirteenth sudoku in the Entropy Miracles series. You can find the others in my profile. All of them use the Entropy rule and have only six starting digits, with no additional clues or constraints.

This puzzle is similar to numbers 10, 11, and 12 — not only in appearance, but also in the solving process.

A few words about the research behind this series. After finding around 30 such sudokus, I decided to write an algorithm to search for all possible cases. This was done, and more than 180 sudokus were found. However, I believe there was a mistake in the algorithm, so the list is likely incomplete. At this point, I have lost interest in the topic, but I am glad to have found 13 rare sudokus that can be solved by human logic. Thank you for your comments and for actively solving the puzzles in this series. I hope you had fun.