Setup and opening position
Three distinct center cells are labeled with their region identities. Other cells begin unassigned, and deterministic clue reveals preserve exactly one valid three-galaxy partition.
Galaxies Puzzle
Partition all nine cells among the three centers so every galaxy is connected and has 180-degree rotational symmetry around its center.
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How to play
Partition all nine cells among the three centers so every galaxy is connected and has 180-degree rotational symmetry around its center.
- Three distinct center cells are labeled with their region identities. Other cells begin unassigned, and deterministic clue reveals preserve exactly one valid three-galaxy partition.
- Assign an editable cell to galaxy one, two, or three, or clear it. A finished galaxy must include its center, remain orthogonally connected, and match itself after a half-turn.
- Partition all nine cells among the three centers so every galaxy is connected and has 180-degree rotational symmetry around its center.
Strategy tips
- Whenever a cell joins a galaxy, locate its half-turn partner around that center and assign both, then check that the pair can still connect back to the center.
- Symmetric cell pairs alone do not make a valid galaxy if they form a detached island, and a center can never be assigned to a different region.
- Use the remaining unassigned cells to test both symmetry and connectivity at once; a leftover cell that lacks a valid partner reveals an earlier region assignment error.
Complete guide
Rules, scoring, and strategy
Galaxies Puzzle is a complete browser implementation with its own versioned rules profile. Assign every cell of a three-by-three grid to one of three marked centers so each resulting galaxy is connected and rotationally symmetric around its own center.
Legal moves and game flow
Assign an editable cell to galaxy one, two, or three, or clear it. A finished galaxy must include its center, remain orthogonally connected, and match itself after a half-turn.
Winning and terminal positions
Partition all nine cells among the three centers so every galaxy is connected and has 180-degree rotational symmetry around its center. Use the remaining unassigned cells to test both symmetry and connectivity at once; a leftover cell that lacks a valid partner reveals an earlier region assignment error.
Practical strategy
Whenever a cell joins a galaxy, locate its half-turn partner around that center and assign both, then check that the pair can still connect back to the center. Symmetric cell pairs alone do not make a valid galaxy if they form a detached island, and a center can never be assigned to a different region.
Questions players ask
What is the objective in Galaxies Puzzle?
Partition all nine cells among the three centers so every galaxy is connected and has 180-degree rotational symmetry around its center.
Which moves are legal in Galaxies Puzzle?
Assign an editable cell to galaxy one, two, or three, or clear it. A finished galaxy must include its center, remain orthogonally connected, and match itself after a half-turn.
What should I plan first in Galaxies Puzzle?
Whenever a cell joins a galaxy, locate its half-turn partner around that center and assign both, then check that the pair can still connect back to the center.