Fill every square with a galaxy centered on one diamond. Each galaxy stays connected and looks the same after a half-turn around its diamond.
Tap a diamond, or any square of its galaxy, to select it. Tap the diamond again to fill or clear the squares touching it.
Tap or drag across squares to fill opposite pairs, or drag out from a diamond. Tap a square of the selected galaxy to clear its pair.
Stars show a connected, symmetric shape with one diamond. It may still need to grow.
More controls
Shapes cannot overlap. Dotted outlines preview the pair; dashed squares mark a problem. A gray square is not joined to its diamond yet.
Hint previews a move. Tap it again to apply.
Arrows move between squares; Enter or Space fills or clears a pair. C selects the next diamond; Delete clears a pair. Z undoes. Escape cancels a gesture.
For a larger board, choose Enlarge, then Pan in Settings.