Slitherlink rules: Draw a single continuous loop by connecting neighboring dots along the dotted lines. The numbers indicate how many edges of a cell are used for the loop. The loop may not touch or cross itself, and it doesn't need to touch all of the dots.
Solving online: puzz.link
For the 2021 version, click here: Puzzle 000523
Solution code: Size of regions outside the loop in clockwise order, beginning in the top left corner
on 2. January 2021, 12:46 by pwahs
Added link to second part of the puzzle
on 31. December 2020, 21:18 by pwahs
Fehlende 3 im Bild ergänzt (der Link war korrekt).
Added a missing 3 in the image (the link was correct).