Logic Masters Deutschland e.V.

Standard sudoku rules applies. Fill the grid with numbers from 1 to 9 so each digit occurs exactly once in every row, column and 3x3 box.

Clues outside is the sum of the first x digits from that direction, where x is the first digit the clue sees. All clues are given.

Only digits which is in the first 3 digits in each direction are shown. For instance, if the x-sum is 21 and 2 is in the first 3 digits and 1 isn’t, then the outside clue would only shows 2.

This puzzle is set by Old Miles from China. It seems it’s been a long time since i said this. Probably because both of us focus more on 6X6 these days. Now that i think ab out this, i think most of the 9X9 puzzles in recent month i need to ask Old Miles to set it. Probably because most people would rather solve many 6X6 than one 9X9.

As for this puzzle, i chose the hard version. I think i accidentally forget scenario in this puzzle, which gave me such an impression. The easy version looks a little bit more organized. But after this puzzle, i think it’s way too easy.

Just to show how 6X6 works, you don’t have to try it. 6X6 x-sum has a lot of hidden rules. For instance, all possible 1s are given.