Logic Masters Deutschland e.V.

This puzzle is a variant of a Normal Sudoku.
rule:

1. Standard Sudoku rules apply;

2.The circle represents that this cell is the sum of two adjacent cells on opposite sides; The square represents that this cell is the difference of two adjacent cells on opposite sides. The double means that both directions meet the conditions; And the single means that only one side satisfy the rules.(Not all signs are given);

Here are some examples：

These symbols should be in the middle of the three parallel cells, and It will be equal to the sum or difference of the next two cells.

Penpa link.Have fun solving!

CTC link. Have fun solving!

It's a very interesting experience to create puzzles with this rule. I hope you like it.

Your feedback and comments are highly appreciated :) Enjoy !