Spiral Galaxies

Spiral Galaxies (also known as Tentaishō or Tentai Show, in a Japanese pun) is a Nikoli logic puzzle.

  • Draw lines along the edges between cells dividing the grid into regions.
  • Each region must contain exactly one circle, undivided.
  • Each region must be two-fold rotationally symmetric around the circle it contains. (That is, if you rotate it 180° around its circle, you get the exact same region.)