Logic Masters Deutschland e.V.

Rules:

Place the digits 1-9 once each into every row, column, and 3x3 box.

The grid is partially covered in fog. Fog can only be cleared by correctly placing all nine digits in a 3x3 box, which will clear the fog from that box.

If two digits are separated by a black dot, one digit is double the other.

The following clues must satisfy each of the following conditions. Lines travel orthogonally through the grid (never diagonally), without branching or intersecting any line (including itself). Every line must be contained in exactly three boxes and cross exactly two 3x3 box borders. Excluding the single line decorated with squares, no line can be the same length as another line.

Thermometer:
Digits along a Thermometer increase moving away from the bulb.

German Whisper:
Adjacent digits along a (green) German Whisper line differ by at least 5.

Parity:
Adjacent digits along a (red) Parity line must have different even/odd parity.

Region Sum:
Box borders divide (blue) Region Sum lines into segments which each have the same sum. Different Region Sum lines may have different sums.

Same Difference:
Every pair of adjacent digits along a (yellow) Same Difference line has the same difference. Different Same Difference lines may have different differences.

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Have fun solving!