13

Galaxies

Symmetric regions around their centres

Rules

Divide the grid into galaxies with walls. Each galaxy has exactly one centre and is symmetric around it: turn it half a turn about the centre and it lands on itself. A centre sits in a cell, on the border of two cells or where four cells meet. Tap a border between cells: wall, a cross for “no wall here”, empty. A long press places a cross at once. Drag along the grid lines to draw a wall in one move; dragging along a wall erases it. A finished, correct galaxy gets shaded.

Board sizes

7×7 · 10×10 · 14×14

Difficulty

Easy · Medium · Hard · Expert

Daily set

yes, in rotation

Hints

named techniques