How to play
Tentai Show — 天体ショー — or Spiral Galaxies is a symmetry puzzle.
- Divide the whole grid into regions called galaxies. Every cell belongs to exactly one.
- Each galaxy is a single connected piece — you can walk between any two of its cells without leaving it.
- Each galaxy contains exactly one dot, and that dot is its centre of symmetry. Turn the galaxy half a turn about its dot and it lands on itself.
- A dot in the middle of a cell, on the line between two cells, or on a corner where four meet — all three are allowed, and each tells you something about the shape.
Tap a cell to hand it to a galaxy. Tap again for the next one, and its opposite half fills in for you.
The rules in full