Cut a dotted grid into shapes that each stay the same when spun halfway around their own dot.
Galaxies Symmetry Puzzle gives you a grid of squares with small dots scattered across it. You place walls along the lines between squares to divide the whole grid into regions. Each region must contain exactly one dot, and that dot has to be its center.
The twist is symmetry. Rotate any region a half turn about its dot, and the result has to match the original exactly. Every board is checked by a solver before it reaches you, so a real answer always exists.
The goal
Every square must belong to one region, and no square is left over. A finished region is fully enclosed, has a single dot in the middle, matches itself after a half turn, and has no stray wall cutting through it. You win when your walls sit exactly on the borders between regions and nowhere else.
A dot can sit in three kinds of spots. It might sit inside one square, on the line between a pair of squares, or at a point where four squares touch. That tells you what the middle of its region looks like.
Strategy notes
- Think in pairs. Each time you hand a square to a dot, its twin on the far side of that dot, at equal distance, joins the same region.
- Separate close neighbors. If two dots sit in the middle of side-by-side squares, the line between them has to be a wall.
- Start with tight spots. Hunt for squares that just a single dot is able to claim while keeping its shape balanced, and give each one to that dot.
- Leave yourself notes. Pull an arrow out of a dot and drop it on a square you have decided on but haven’t walled in yet. The arrow turns to point back at its dot.
- Check for glow. A closed shape that doesn’t light up has a problem, such as a wall inside it or a missing mirror square.
Picking a board
The Type menu offers 7x7, 10x10 and 15x15 grids. Each size comes in two difficulties. Normal boards can be cracked through careful step-by-step logic. Unreasonable boards may force you to test a guess and back out if it fails, so save those for after Normal feels comfortable. Custom lets you set any width, height and difficulty you like.
Keyboard players can press N for a new board, U to undo and R to redo. The same actions sit in the menu buttons above the grid.
Controls
| Action | Keyboard | Mouse | Touch |
|---|---|---|---|
| Draw or erase a wall on a grid line | Arrow keys to move, then Enter on a line | Left-click the line | Tap the line |
| Drag a reminder arrow out of a dot | Enter on a dot to pick up, Enter again to drop | Right-drag from the dot to a square | Press and hold the dot, then drag |
| Move or delete an arrow | — | Right-drag it elsewhere, or off the grid | Press and hold it, then drag |
| New game, undo, redo | N, U, R | Menu buttons above the grid | Menu buttons above the grid |
Galaxies Symmetry Puzzle FAQ
Can I solve Galaxies Symmetry Puzzle on a phone or Chromebook?
Yes. Tap a grid line to add or remove a wall. To drag a reminder arrow, keep your finger down on a dot. On a Chromebook you can click, or use the arrow keys and Enter. Large boards are easier to read with a phone turned sideways.
What do I do if I get stuck?
Undo has no limit, so you can try an idea and roll it back. Restart clears the board. If you are truly stuck, the Solve button shows the answer. Starting on a smaller Normal board also helps you learn the patterns.
How do I know a region is correct?
A region lights up when it is closed off, holds only one dot at its center, matches itself after a half turn, and has no extra wall inside it. If a closed shape stays dark, one of those rules is broken.
Is this a one-player game?
Yes. It is a solo logic puzzle you work through at your own pace, one board at a time. Press N or the New game button whenever you want a fresh grid, and pick a size and difficulty that fits your mood.
