Reveal every safe square and flag the mines. Your first tap is always safe.
Touch: double-tap to reveal (a single tap previews in the magnifier) · long-press to flag (or turn on ๐ฉ flag mode: one tap flags) · double-tap a revealed number to chord (open its neighbors when its flags are placed)
Mouse: click to reveal · right-click to flag · click a satisfied number to chord
Keys: arrows move the cursor · Enter/Space reveals (chords on a number) · F flags