Three Loops

Normal sudoku rules apply.

The grid contains three loops. A loop may be "German Whisper", "Entropic", or "Region Sum". The nature of the loops (which may repeat) are to be determined by the solver.

German Whisper: Adjacent digits along a German Whisper line must differ by at least 5.

Entropic: Any set of three sequential cells along an Entropic line must contain a low (1-3) digit, a middly (4-6) digit, and a high (7-9) digit.

Region Sum: Digits on the line have an equal sum N within each box it passes through. If a line passes through the same box more than once, each individual segment of such a line within that box sums to N separately.