Reveal every safe sector to win. Numbers tell you how many mines touch that sector, including diagonally.
Mark your suspicions. Turn on Flag mode, right-click, or hold a sector to plant a flag. Tap a revealed number when its neighboring flags match to clear the rest. Wrong flags can cost you!
A little extra firepower. After your first reveal, Sonar finds a guaranteed safe, unflagged sector. You get two charges per voyage, each costing 200 points; each safe sector earns 100 points. Any mine hit sinks your ship. Your first landing and its neighbors are always safe.
At your keyboard: arrow keys navigate the chart; Enter reveals or flags; F toggles Flag mode. Progress, records, and themes are saved automatically.
Your current voyage will be left behind. Your records and theme are kept.