An entry in Fortnightly Topic Challenge #48: Unusual tag mix
After pondering what my next puzzle would be about I decided to change my base towards the realm of slitherlink puzzles.
I found this krazy site containing a variety of non-standard grid slitherlink puzzles, and took some inspiration from there.
This is my favorite form: it contains squares, pentagons, hexagons, heptagons as well as octagons.
There is a question hidden in this puzzle, if you can answer it you earn the check mark.
There is a hint in the flavourtext
The digits in green form one big number