A little reflection.
Flip the polygons until their colors match the small pattern in the corner.
Tap or click a gap between shapes. Every polygon on that reflection axis turns together. Undo and restart are always available.
Using a keyboard? Tab to a gap, then press Enter or Space. Each gap’s tooltip shows its keyboard shortcut.
Keep it close
Play here in your browser, or use your browser’s install option. On iPhone or iPad, look for Add to Home Screen in the Share menu. In Safari on Mac, use Add to Dock.
Preparing offline play…
Progress is saved in this browser. It doesn’t sync between devices, and clearing site data removes it.