Logic Masters Deutschland e.V.

This puzzle was inspired by Clocksmith's 4x4 parasite puzzle: Parasitic Training.

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Related Puzzles: Parasite Sudoku: Larvae and Parasite Sudoku: Adults

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The rules are as follows:

• Place the digits 1-4 once in every row, column, and region.
• Parasites: Draw parasites moving orthogonally through the grid that connect all circles that share the same digit. Parasites may not move diagonally, branch, or cross themselves nor each other, but they may touch themselves and each other otherwise. The start and end of each parasite must occur on distinct circles, and all circles belong to parasites. The two types of parasites are "larva" and "adult."
  • Larvae must contain a total number of bends equal to the digit in its circles, and at least one of those bends must occur on a cell where its circle-digit appears outside of a circle.
  • Adults must contain a total number of bends between each circle (not counting bends on circles) equal to the digit in its circles. Additionally, all the digits an adult crosses are grouped by the region they belong to, and the sum of all the digits in each group must be divisible by that adult's circle-digit.

Here is an example to illustrate the rules:
The puzzle is available on SudokuPad. Have fun solving!