Logic Masters Deutschland e.V.

This puzzle is the first one I ever set using my Destruction constraint, making it the first puzzle with this ruleset. It precedes Parasitic Destruction by almost a year. If you haven't gotten around to solving Parasitic Destruction, perhaps this puzzle can serve as practice.

The rules are as follows:

• Place the digits 1-9 once in every row and column.
• Chaos Destruction: All given regions must be "destroyed" by making sure they do not contain all the digits 1-9. The grid also consists of nine hidden, orthogonally connected regions that each do contain all the digits 1-9. Digits in circles represent how many of its orthogonally and diagonally adjacent cells, including itself, belong to both the given and hidden regions where the circle resides (i.e., where they overlap).


Here is an example to illustrate the rules. You can attempt this sample puzzle on SudokuPad.





The puzzle is available on SudokuPad. Have fun destroying!