Logic Masters Deutschland e.V.

---- RULES ----

Normal Sudoku rules apply: Fill the grid with digits 1 to 9 appearing once each in every row, column, and 3x3 box.

Region Sum Loop: Draw a single 1-cell-wide loop of orthogonally connected cells into the grid. Different loop segments cannot touch, not even diagonally. The loop acts as a Region Sum Line. Numbers on a Region Sum Line have the same sum in each 3x3 box the line passes through. If a line passes through a 3x3 box multiple times, each individual segment sums separately.

Zipper Lines: Digits an equal distance from the center of a lavender line sum to the digit in the middle of that line.

Circles: Cells containing a circle must be on the loop and the digit in it counts the total number of cells in the respective 3x3 box that are part of the loop, including itself.

Less-than: The Less-than sign points towards the lower of the two adjacent digits.

---- LINKS ----

Solve this puzzle using SudokuPad

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This Sudoku is part of my series of "build-your-own-loop Sudokus". If you liked solving this puzzle or if you prefer other combinations of loop logic and constraints, feel free to give the other sudokus of the series a go too:

	Loop Logic	Loop Constraint	Further Constraints
Mid-Loop	Mid-Loop logic	Entropic Line	Kropki Dots
Whispering-Zipper- Loop	Counting Cells	Dutch Whispers	Zipper Lines X-clues
Super Bowl Loop	Oponents, out-of-bounce	Polarity Line	Kropkis, XV, Nabner, Zipper
Linesweeper Loop	Linesweeper clues	Parity Line	Little Killers
Modular-Zipper- Loop	Counting Cells	Modular Line	Zipper Lines X-clues
Balance Loop	Balance clues	Parity Line	Little Killers
Entropic-Zipper- Loop	Counting Cells	Entropic Line	Zipper Lines X-clues
Hiking-through- the-Fog Loop	Signposts	Dutch Whisper, Polarity Line	Kropki Dots X-clues
Renbanimo Loop	Pentominos Guiding Cells	Renbanimos	Kropki Dots Odd cells
Deceiving Loop	Wrogn Clues	Wrogn Clues	9 different constraints
Count-the- Whispers Loop	Counting Cells	German Whispers	Kropki Dot
Whisper-me- Sum-thing Loop	Line-sums	German Whispers	Kropki Dots
Road Running Loop	Road Runner	Parity Line	Kropki Dots
Magically Modifying Loop	-	Incrementers, Decrementers, Nullifiers	Magic Squares, Killer cages, Kropki Dots
Skiing Loop	Gates	German Whispers	Kropki Dot, Between Lines
Behaving Loop	3x3 boxes	Polarity Line	Kropki Dots
Magical Loop	Guiding cells	Modular Line	Magic Squares
Foggy Loop	Guiding cells	Parity Line	Fog of War, Killer Cages
10-Suȵ Loop	Moon-or-Sun	10-Line	Killer Cages
Counting Loop	Galaxies	Counting Line	Killer Cages, Kropki Dots, Quadruple Clues
Shining Loop	Moon-or-Sun	Parity Line	Killer Cages
Interfering Loops	Slitherlink + Masyu	Entropic Line + Parity Line	Killer Cages
Slithering Loop	Slitherlink	Entropic Line	Killer Cages, Little Killer
BigBang Loop	Galaxies	Parity Line	Row/Column Indexer, Kropki Dots
Summing Loop	Star Battle	Region Sum Line	Killer Cages, Skyscraper, Kropki Dots
Whispering Loop	Star Battle	German Whispers	Sandwich Sum