Logic Masters Deutschland e.V.

Normal Sudoku rules apply.
Digits in killer cages sum to the given total.
Digits connected by an X sum to 10.

Three snakes are living in the grid. Snakes are lines that move horizontally, vertically or diagonally from digit to digit. They do not overlap or cross each other or themselves. Digits in cages cannot be reached by the snakes.
All three snakes consist of 14 digits. Furthermore:
• One of the snakes contains only digits of a single parity
• One of the snakes has its head in the same box as its tail
• One of the snakes has both modular and entropic properties
• One of the snakes contains digits from all 9 boxes
• One of the snakes has German Whisper properties
• On one of the snakes, the digits sum to 90. On the other two snakes, the digits sum to 67.

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Definitions:

Entropic Lines: Any set of three sequential cells along an entropic line must contain a low digit (1,2,3), a middle digit (4,5,6), and a high digit (7,8,9)

Modular lines: every set of three sequential digits along a line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}.

German whisper lines: Every two adjacent digits on a line must have a difference of at least 5.