Logic Masters Deutschland e.V.

Normal Sudoku rules apply.

The even digits in all boxes except box 5 form a closed 1-cell wide ring made up of exactly 2 tetromino shapes. 6 of those are L-shapes.

The cells with a gray square contain an even digit.

Digits along a thermometer must strictly increase, with the lowest digit being in the bulb of the thermometer.

Digits in a cage add up to the number in the top left corner of the cage and digits in a cage may not repeat.

You can try this puzzle on F-Puzzles