Logic Masters Deutschland e.V.

Rules:
Normal sudoku and Arrow rules apply:
Place the digits 1-9 once each in every row, column, and box.
Digits along an arrow sum to the number in the attached circle.

Make a 1-cell-wide loop of orthogonally connected cells, which does not branch or touch itself – not even diagonally.
The loop acts as a Ten Line: it can be divided entirely into contiguous, non-overlapping segments, each consisting of cells that sum to 10. (A segment may contain repeated digits.)

Each arrow's circle is on the loop.
The digit in a circle indicates how many loop cells it can see horizontally or vertically combined, including itself. Non-loop cells block the vision.

• Teeny Ten Loop (6x6 Arrow)
• Rising Tenperatures (6x6 Thermo)
• Heat Intensity (9x9 Thermo)