Logic Masters Deutschland e.V.

I think the logic flows nicely on this one which is mainly an equal sum lines/killer cage variant with an extra negative values rule. Testing seemed to give this a rating of about 3 stars. Please enjoy.

Rules.

Classic sudoku rules apply.

Cages total to the value shown in their top left corner.

Blue lines are equal sums lines. The total of a line segment must be equal in each box the line passes through

There is a hidden negative 3 by 3 box somewhere in the grid where all the numbers count as the negative of the value in the cell, except for Sudoku purposes where the negative is ignored. The 3 by 3 area may or may not repeat values.

For clarity, if a cage or equal sum line is in, or partially in the negative box, only those values within the box count as negative.

The Puzzle.

CTC version with solution check here

Penpa+ version with answer check here

Please enjoy and comment if you like this. It is appreciated. Thank you.