Logic Masters Deutschland e.V.

This may be a new ruleset or it may have been implemented before. It is essentially just X sums but instead the sum is inside the grid and the arrows indicate the directions. Enjoy!

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Puzzle: Interior X-sums (fog)

Rules:

Normal 9x9 Sudoku rules apply.

Fog: The grid is covered in fog. Placing a correct digit will clear the fog around that cell. No guessing required.

X-sum Boxes: The digit(s) in a box is the value of the sum of the first X digits in the direction of the arrow where X is the digit in the cell the arrow points to. Two cell wide boxes represent a 2 digit number read from left to right. Digits cannot repeat along an X sum, not even on a diagonal. The arrow always points to an adjacent cell.

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