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Each number shows how many mines touch that cell. An octagon touches 8 cells and a diamond touches 4. Tap to open a cell, hold to place a flag, and tap a number whose flags are all placed to open everything else around it. The flag button at the bottom switches what a tap does: open, flag, or mark "?" on a cell you're not sure about yet.

Never. Every level is checked by a solver, so it can be cleared by logic alone. If you're stuck, there's always a cell you can prove is safe. A Hint will show you one.

Each level gives you 3 shields. Hitting a mine breaks one. If you lose all of them, the level is lost, but you can keep going with an extra Shield.

You have up to 5 lives. Losing a level costs one, and so does restarting or abandoning a level after you've hit a mine. A life comes back every 30 minutes; the timer is next to the hearts. Out of lives? Wait for the next one, or buy one with coins in the market.

Clearing a level for the first time earns coins: more for more stars. Every first clear also fills the gift bar, and a full bar gives a power-up and bonus coins. Tap your coins to open the market and buy power-ups whenever you like.

No. Octamine saves an unfinished level after every move. Open the same level again and you'll carry on exactly where you were. On a timed level the clock waits for you.

Tap the gear on the home screen, the level map or during a level. There are sliders for sound effects and music, and a switch for vibration.

Right now your progress is saved on your phone. Cloud save, which will keep your progress when you change phones, is on its way.

Uninstalling Octamine deletes everything it kept on your phone. For online data, see Your data.