Logic Masters Deutschland e.V.

This is my first success at building a fully rotationally symmetrical puzzle. Many thanks to ThoughtByte for the inspiration, encouragement and testing. He rates difficulty at 3.5. I hope you enjoy!

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Normal Sudoku rules apply.

Digits along a blue thermos increase from the circle end. Digits in yellow circles are odd. Neighbouring digits on a green German Whisper line differ by at least 5. Digits on a purple Renban line are consecutive.

Additionally:
- Each thermo's digits sum to 10.
- Every German Whispers line contains exactly one friendly cell. Every whisper uses a different friendly digit.

(A cell is friendly if it contains its own box, column or row number. Eg, the cell at Row 5 Column 7 could contain a 5, 7 or its box number 6.)

Solve at f-puzzles

Solve at CtC