Logic Masters Deutschland e.V.

I made this puzzle following Scojo's prompt to use (some kind of) thermometers along with x-sums.

• Normal sudoku rules apply.
• Doppel-Dög loop:
  • Draw an orthogonal non-branching closed loop that doesn't cross or touch itself, not even diagonally.
  • The loop "starts" at the cell marked with the dog and is considered to be oriented in the direction indicated by the arrow (i.e. r1c9 and r1c8 are on the loop).
  • A cell on the loop with a digit D will have a value equal to the digit D steps away along the loop in the orientation given by the arrow.
  • Cells not on the loop will have a value equal to the digit in them.
• Box borders split the loop into connected components and on each component digits (not values) decrease following the orientation of the loop.
• Clues outside the grid give the value sum of the first X cells seen from the clue in its respective row or column where X is the value of the cell closest to the clue.
• Cells marked with a circle are not part of the loop and have a digit equal to the count of the, up to 8, neighboring loop cells.
• Cells joined by a ball have the same value.

Online in Sudokupad

More Doppel-Dögs:

• can i pet that dog!? / please, can we keep him!?
• did you say walkies!?
• a night in the city
• the herding party
• yo tenía diez perritos
• the year of the dög
• Convection Currents by ThePedallingPianist
• Doppel-Dög Sandwich by phil_the (hat)
• Tentropic Terrier by Scojo