Logic Masters Deutschland e.V.

I always wanted to create a blank grid with somewhat standard and short rules. Here is my newest creation. I hope you have as much fun solving it as I had setting it :)

Normal Sudoku rules apply.

All columns and rows are region sum lines (in each box, the digits sum to the same value along the lines)

The negative diagonal (R1C1 to R9C9) is a 9 cell thermometer (digits are strictly increasing from bulb to tip, and the bulb could be on either end).

There are exactly 17 friendly digits in the grid (digits are friendly, if they are equal to their column, row or box number.)

The cells containing the friendly digits are rotational symmetric at every 90° rotation.

• https://sudokupad.app/ybd2zxl1ti