The original puzzle may have been of Nikoli's development. The Conceptis version often involves multiple colors of dots and yields a picture.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid containing dot clues within cells, on edges, or at corners.
The goal is to mark off regions, one for each dot clue.
The solved grid must satisfy the following conditions:
Every cell belongs to exactly one region.
Each region is rotationally symmetrical (at 180°) around the clue it contains.
In picture-based puzzles, each region is colored in to match the clue.
Galaxien; Galaxies; Spiral Galaxies; Spiralgalaxie; Tentai Show