Minesweeper patterns: 1-2-1, 1-2-2-1 and more
Most Minesweeper moves come from two simple ideas: a number whose mines are all accounted for makes its other neighbors safe, and a number with no spare room makes all of its neighbors mines. Named patterns like the 1-2-1 and the 1-2-2-1 are shortcuts built from those two ideas. Learn to spot the shapes and boards that look stuck start to open up.
This guide walks through six patterns with original diagrams, explains why each one works, and ends with interactive boards where you can practice finding the next safe move.
How to read the diagrams
Every number counts the mines touching its tile. Subtract any mines you have already flagged and what is left is that number’s remaining mines. Its unknown neighbors are the touching tiles that are still hidden and unflagged.
In the diagrams, hidden tiles carry letters (A, B, C…) so we can talk about them. A cyan ring marks the numbers being used, a green check marks a tile that is provably safe, and a red mine marks a tile that is provably a mine. Each example is a tiny complete board, so the board edge is drawn as a glowing outline. In a real game the same shape appears next to any cleared area, as long as every hidden tile touching the numbers is accounted for.
Rule 1: all the remaining squares are mines
If a number’s remaining mines equals its unknown neighbors, every one of those neighbors is a mine. It is the most basic deduction in the game and the one you will use most.
Here the 2 touches exactly two hidden tiles, A and B. It needs two mines and has two places to put them, so both are mines.
Rule 2: all the remaining squares are safe
The opposite case: if a number’s remaining mines is zero, because you have already flagged all of its mines, every other unknown neighbor is safe.
B is flagged. The first 1 touches A and B, so its mine is accounted for and A is safe. The second 1 touches A, B and C, and it is also satisfied by B, so C is safe too. In versions of Minesweeper that support chording, this is also the situation where activating a satisfied number can open its remaining neighbors automatically.
The 1-1 pattern
Two 1s side by side where the second 1 sees every hidden tile the first one sees, plus extras. Both need exactly one mine, and the first 1 already has its mine among its own tiles, so the extra tiles cannot hold one.
The first 1 touches A and B. The second touches A, B and C. One mine is somewhere in A and B, which is all the second 1 needs, so C is safe.
The idea behind it
When one number’s unknown neighbors are a subset of another’s and both have the same remaining mines, every tile outside the subset is safe.
The 1-2 pattern
A 1 next to a 2, where the 2 sees every tile the 1 sees plus exactly one extra. The 2 needs one more mine than the 1, and the extra tile is the only place for it.
The 1 touches A and B and holds one mine. The 2 touches A, B and C and holds two. Subtract: C must be a mine.
The idea behind it
Same subset rule as the 1-1. When the difference in remaining mines equals the number of extra tiles, all of the extra tiles are mines. When the difference is zero, they are all safe. Notice that you can prove C is a mine without knowing whether A or B is.
The 1-2-1 pattern
This is the most recognizable pattern in Minesweeper. Three numbers in a row, 1, 2, 1, with three hidden tiles beside them. The tile next to the 2 is safe, and the tiles next to the 1s are mines.
Why it works: the left 1 needs exactly one mine in A or B. The right 1 needs exactly one mine in B or C. The 2 says there are two mines among A, B and C. Suppose B were a mine. Then both 1s would already be satisfied, so A and C would be safe and the group would hold only one mine, not two. That is impossible, so B is safe. With B safe, each 1 has only one place left for its mine, so A and C are mines.
It works in any direction
Patterns do not care which way the board is turned. Here is the same 1-2-1 standing in a column beside a side wall.
The one condition: each 1 must touch only the three tiles of the pattern. If a 1 touches another hidden tile, count that tile too before you trust the shortcut.
The 1-2-2-1 pattern
A longer relative of the 1-2-1: the numbers 1, 2, 2, 1 in a row above four hidden tiles. The two middle tiles are mines and the outer two are safe.
Why it works: look at the left end first. The 1 and the 2 form a 1-2, so C is a mine. Now look from the right end: another 1-2, so B is a mine. That gives each 1 its mine, so A and D, the outer tiles, are safe.
Like the 1-2-1, it holds when the 1s touch no other hidden tiles. If your 1s have a third hidden neighbor, treat the shape as a hint to compare numbers, not as a guarantee.
Quick reference
| Pattern | What you see | Mines | Safe |
|---|---|---|---|
| All remaining are mines | A number whose unknown neighbors equal its remaining mines | Every unknown neighbor | None |
| All remaining are safe | A number whose mines are all flagged | None | Every other unknown neighbor |
| 1-1 | Two touching 1s; the second sees extra tiles | None | The extra tiles |
| 1-2 | A 1 touching a 2; the 2 sees one extra tile | The extra tile | None |
| 1-2-1 | 1, 2, 1 in a row above three hidden tiles | The tiles beside the 1s | The tile beside the 2 |
| 1-2-2-1 | 1, 2, 2, 1 in a row above four hidden tiles | The tiles beside the 2s | The tiles beside the 1s |
Patterns are shortcuts, not magic
A named Minesweeper pattern only works when you account for every hidden tile touching the numbers involved. Before you use a familiar pattern, check whether an extra hidden tile changes the possibilities. The numbers always tell the truth. The pattern is simply a shortcut for reading them.
Practice: find the next safe move
Each board below can be solved with the patterns above and nothing else, with no guessing. Tap a hidden tile to reveal it if you can prove it is safe, or switch to Flag mine to mark a tile you can prove is a mine. A wrong move costs nothing, so experiment.
Minesweeper patterns FAQ
What is the 1-2-1 pattern in Minesweeper?
A 1, a 2 and a 1 side by side along an edge, above three hidden tiles. The two tiles under the 1s are mines and the tile under the 2 is safe, as long as each 1 touches no other hidden tiles.
What is the 1-2-2-1 pattern in Minesweeper?
A 1, 2, 2 and 1 in a row above four hidden tiles. The two tiles under the 2s are mines and the two tiles under the 1s are safe, as long as the 1s touch no other hidden tiles.
Do Minesweeper patterns work when rotated?
Yes. A pattern is just arithmetic on neighboring numbers, so it works in any direction: along a side wall, along the top or bottom, or mirrored.
Do I need to memorize patterns to win Minesweeper?
No. Every pattern comes from comparing what two numbers can see. Memorizing the shapes just makes you faster at spotting those comparisons.