Guides Guessing
Do You Have to Guess in Minesweeper?
Sometimes, yes. On a random Minesweeper board, the numbers can’t always tell you where the last mines are. Here’s how to spot a real guess, how to pick the safest tile, and how no-guess boards take the luck out of it.
The short answer
On a classic random board, yes, sometimes. The mines are placed at random. Some layouts leave tiles that no number on the board can tell apart.
Expert boards have denser mines, so they need a guess more often than Beginner.
No-guess (NG) boards are different. They’re generated and checked so every mine can be found with logic from the start.
RetroSweep’s daily boards are no-guess. Classic boards are random, like the original Windows game. We kept the chaos for authenticity.
What a real 50/50 looks like
A true 50/50 is two tiles, one mine, and no number that touches one tile without the other. In the example below, both unopened tiles touch the same two numbers. Every other neighbor is a flagged mine or the edge of the board.
Spots like this mostly turn up in corners and along the edges. There, the border of the board hides the tiles that would have told the two apart. The edge is not on your side here.
Check it’s really a guess
Most positions that feel like a guess aren’t. Your gut is a good friend and a bad Minesweeper player. Before you click on a hunch, run through this list:
- Every number, reduced. Subtract the flags each number touches, then look again for 1-2, 1-2-1 and 1-2-2-1. The patterns guide has diagrams.
- Numbers that share tiles. Sometimes every unopened tile touching one number also touches a second number. Then the difference between their values is the number of mines in the tiles only the second one touches.
- Both sides of a region. A patch of unopened tiles often has numbers on two sides. Something unclear from one side can be forced from the other.
- The mine counter. Late in the game, the number of mines left can settle a whole region.
How to pick the safest guess
When it really is a guess, not all guesses are equal.
Compare the odds
A number spreads its mines over the unopened tiles it touches. A 1 touching two unopened tiles gives each about an even chance. A 1 touching four gives each about one in four.
Neighboring numbers shift these odds, so treat them as a rough guide.
A tile away from every number has odds close to the mines left divided by the unopened tiles left. Partway through an Expert game, that’s often around one in five. That beats a 50/50 by a long way.
Pick the guess that tells you the most
If two guesses are about as risky, take the one that tells you something if it’s safe. A tile that could open a new area, or touch an unsolved region from a new side, beats a tile that only settles itself.
Guess early
If one part of the board will need a guess, you can take it before clearing the rest. If it goes wrong, you’ve lost less time.
The exception is a spot the mine counter could settle once the rest of the board is done. Leave that one for the end.
No-guess boards
A no-guess board is generated with a solver. The game places the mines, then plays the board from a fixed start, using only logic and the mine counter. If the solver ever gets stuck, the layout is thrown away.
Only boards it can finish are kept. That’s what the NG tag means on RetroSweep’s daily boards, which have been no-guess since September 27, 2026.
No-guess doesn’t mean easy. It means every loss comes from a misread, not bad luck. Some boards need deductions that go well past the simple patterns.
So if you lose a daily, you can’t blame the coin. Sorry.
Questions
Is Minesweeper always solvable without guessing?
No. On a random board, some mine layouts leave tiles that no number can tell apart, so a guess is forced. No-guess boards are generated and checked so this never happens.
What is a 50/50 in Minesweeper?
A 50/50 is a spot where two tiles hold one mine and no number on the board touches one without the other. Nothing you do can reveal which is the mine, so you have to pick one.
What does no-guess mean in Minesweeper?
A no-guess (NG) board can be solved from start to finish with logic alone. The generator checks each board with a solver and throws away any layout that would need a guess.
Is Minesweeper NP-complete?
In a sense. In 2000, the mathematician Richard Kaye showed that deciding whether a partly revealed Minesweeper board is consistent is NP-complete. That result is about arbitrarily large boards. Everyday boards are solved with small patterns like 1-2-1.