Logic Masters Deutschland e.V.

Today is a holiday that celebrates lovers in my hometown, so I've decided to publish this puzzle — even though I made it three months ago, which also happened to be a love-related day.

I apologize for any issues, as I'm putting this out in a bit of a rush. Thank you for your understanding and feedback.

Rules:

• Irregular 5x5 Sudoku rules apply: Place digits 1-5 in the cells so that no digit repeats in any row, column or outlined region.
• Inner 4x4 Sudoku: Place operators "＋"(plus), "－"(minus), "×"(multiply), "÷"(divide) in the white dots located at the grid intersections, such that no operator repeats in any row or column.
• Diagonals: Digits and operators cannot repeat along the two main diagonals.
• Between line: Digits on a grey line between two circles must lie between the digits in the circles.
• Operator Between line: The values of the operators on a pink line must lie between the values of the operators in the two bigger white dots. The value of an operator is defined as the result of applying that operator to the two diagonally adjacent digits along the pink line. In particular, the value of the operator “－” is the difference of those two digits and thus won't be negative. The value of the operator “÷” must be an integer. Solvers don't have to consider the values of the operators that are not on the pink line.

I think the difficulty is somewhere around low 2*. However, you may want a pen and paper to solve it.

Play on SudokuPad

Another version with only the 5x5 grid