Logic Masters Deutschland e.V.

This puzzle was set for round 1 of the first Puzzle Agency Championship season hosted by Agent, in which participants get a few days to set a puzzle for each round. For this round, the puzzle had to involve Knapp daneben clues, whose values are off by exactly one.

Rules:

Regular sudoku rules apply; place the digits 1-9 in every row, column, and outlined 3x3 box exactly once each.

Knapp Daneben XV: An X connects two digits that sum to 9 or 11. A V connects two digits that sum to 4 or 6. Not all X's and V's are necessarily given.

Solve online:

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