How to Play Galaxies
Divide the grid into regions, each containing exactly one galaxy center and having 180° rotational symmetry around that center.
Try it now — Easy 8x8 →The Rules
- Divide the grid into regions, one per galaxy center dot
- Each region must have 180° rotational symmetry around its center dot
- Every cell belongs to exactly one region
- Galaxy center dots can be on cell centers, on edge midpoints, or on corner intersections
Available in 3 sizes (6x6, 8x8, 10x10) and 3 difficulty levels (easy, normal, hard).
See It in Action
Divide the grid into regions — each contains one center dot and has 180° rotational symmetry
How to Play
- For each dot, find its rotationally symmetric partner cells — both cells of each symmetric pair must be in the same galaxy
- Dots on edges or corners have a fixed symmetry axis — use this to determine paired cells quickly
- Eliminate impossible pairings where a cell is equidistant from two different galaxy centers
- Build each galaxy outward from its center, verifying 180° symmetry at every step
Pro Tips
Every cell must be the 180°-rotated partner of another cell around the center — the center is literally the midpoint
Galaxy dots on grid intersections always have four adjacent cells — all four must belong to the same galaxy
Two nearby galaxy centers compete for the cells between them — the midpoint rule assigns each cell to its closest center
Frequently Asked Questions
What is Galaxies?
Galaxies (Spiral Galaxies) is a logic puzzle where you divide a grid into regions. Each region has exactly one galaxy center (a dot), and the region must be rotationally symmetric at 180° around that dot.
Choose Your Challenge
Start with easy to learn the rules, then progress to harder difficulties.