Every safe square has a reason. Reveal every safe square. Numbers count mines in the eight surrounding squares. Switch between Reveal and Flag. Tap an opened number to reveal its neighbors when the right number of flags surrounds it. Each puzzle opens with a safe area and is checked for a deduction-only solution. A mine ends the attempt; Undo lets you recover. GEMDUCK LIMITED. Free to install on Android. Contains ads. See Google Play for current release details and optional purchases.