What this is
Ten mines are hidden on a 9×9 board. Open every square that is not a mine and you win. Open a mine and it ends there.
Each opened square shows a number: how many mines sit in the eight squares around it. A blank square has no mines nearby, and when you open one its neighbours open with it.
Your score is the time taken. Faster is better.
Controls
| Open a square | Tap / click |
| Place a flag | Long press · right-click · F key · turn on the 🚩 button and tap |
| Open all around | Tap an already-opened number |
A flag is your own note that says “a mine is here”. Flagged squares will not open even if you tap them by accident. Flags are not scored — you win by opening every safe square, whether or not the mines are flagged.
Your first move is never a mine. Mines are placed after the first tap, avoiding that square and its neighbours, so the first move always opens an area.
How to read a board
A 1 against a wall
If a 1 has exactly one closed square left beside it, that square is the mine. This
happens constantly along edges and next to opened areas. Flag it.
The reverse is just as useful: if a 1 already has one flag next to it, every other closed
square around it is safe. Tap the number to open them all at once.
The 1-2-1 pattern
Three numbers reading 1 2 1 in a row with closed squares along one side: the mines are
under the two outer 1s, and the square under the 2 is safe. This is the pattern worth
memorising first.
The 1-1 pattern
Two 1s side by side with a wall or opened area closing one end: the mine is usually on
the diagonal beyond the outer 1. This and the 1-2-1 will solve half of a normal board.
Subtracting numbers
When two numbers sit next to each other, subtract the squares they share. If a 2 and a 1
see almost the same squares, the difference tells you where the extra mine is. When you feel
stuck, comparing two neighbouring numbers usually opens the way.
Getting faster
Do not flag everything. You win by opening safe squares, not by flagging mines. Flag only what you need to use a number, and open the rest. Fast players flag as little as possible.
Use open-all-around. Once a number has that many flags beside it, tap the number to clear its neighbours in one move. Without it the endgame becomes pure clicking.
Leave a stuck corner alone. Grinding on one spot costs the most time. Open a different region that still has certain squares; when you come back, the stuck corner often has more information around it.
Guess quickly when you must. Some layouts genuinely cannot be resolved by logic. Pick the lower-risk square and move on — hesitating costs more than the guess does.
Daily challenge
A new board opens every midnight (KST), and everyone gets the same mine layout that day. Because the mines are placed around your first tap, starting from the same square makes the boards identical — which is part of the fun. Rankings reset the next day.