Logic Masters Deutschland e.V.

I borrowed Neokart's Polyline meta ruleset to make a puzzle with this title. And I like polylines so much I ask everyone to make their own.

• Normal sudoku rules apply.
• Polyline:
  • Box borders split the line into connected components, and each component is a <lang> Literal Line for exactly one of the following instances of <lang>: German, Spanish, French, Italian, and English.
  • Two adjacent segments along the line may not be <lang> Literal for the same <lang>.
• <lang> Literal Lines (segments):
  • Let N be the number of sets of digits with the same number of letters in their <lang> name. (Values of N for each instance of <lang> are given below.)
  • Every N consecutive cells along the segment must contain digits with a different number of letters in their <lang> name.
  • Segments with less than N cells must have digits with a different number of letters in their respective <lang> names.
• Cells marked with a circle contain odd digits.
• Cells marked with a square contain even digits.

Online in Sudokupad

Notes:

• The sets of digits with the same number of letters for the respective <lang> instances:
  • German: [1234589],  [6],  [7]  (N = 3)
  • Spanish: [12],  [368],  [4],  [579]  (N = 4)
  • French:  [1],  [25789],  [3],  [4],  [6]  (N = 5)
  • Italian:  [1236],  [4],  [5],  [7],  [89]  (N = 5)
  • English:  [126],  [378],  [459]  (N = 3)
• Examples: the sequence 6,7 is <lang>-Literal for all five <lang>s, and the sequence 7,8 is German-, Spanish- and Italian-Literal.

More polylines:

• Neokart's "Polyline" series: [1] [2] [3]
• gdc and ChinStrap's PolyLine Loop