Why Minesweeper sometimes makes you guess
You’ve played carefully for three minutes. Every flag is right. Then you reach the last corner and there it is: two covered squares, one mine, and nothing on the board that tells you which is which. You click, and half the time the game ends.
That moment is the thing people complain about most in Minesweeper. It isn’t a bug, and it isn’t bad play. It comes from the way the classic game deals its boards.
The mines are placed at random
In the original Windows game, and in the classic levels here, the mines are scattered at random once you make your first click. The game doesn’t check whether the result can be solved. Most of the time it can, but nothing guarantees it.
The most common trouble spot is a pair of squares that share exactly the same neighbours as far as the numbers can see. A 1 touching two covered squares, with no other number touching either of them, is the classic case. The 1 says there is one mine. It can’t say which square it’s in, and nothing else can either.
How often it happens
It depends on the board. On Beginner it’s fairly rare, because the board is small and open. On Expert it’s common: a good share of Expert boards need at least one guess somewhere. On our Master board, with 28 percent of the squares mined, nearly every game needs a few.
Speed players accept this as part of the game. Their answer is to make guesses early, when losing costs less time, and to pick the square with the best odds.
Making a better guess
Not all guesses are equal. A few habits help:
- Clear everything certain first. New numbers elsewhere can settle the spot you were about to guess.
- Look for better odds. A square far away from any numbers has about the same chance of being a mine as the board as a whole. On Expert that’s around one in five, which beats a straight 50/50.
- Choose the square that tells you more. If it’s safe, a square in the open may reveal a number that unlocks a whole area. A square wedged in a corner often won’t.
Boards that never need a guess
The other answer is to change how boards are dealt. A no guess board is checked before you play it. After your first click, the game deals the mines and runs a solver over the board, opening only squares that must be safe and flagging only squares that must be mines. If the solver gets stuck anywhere, the board is thrown away and a new one is dealt.
Our solver uses the same reasoning a careful player does: single numbers first, then pairs of numbers that share covered squares, then the total mine count. On Expert, around one random board in ten passes, so finding one takes a few milliseconds.
The result is a board where every game can be won with logic alone. If you lose, you misread something, which feels very different from losing to a coin flip. You can try it in No guess mode, at Beginner, Intermediate or Expert size.
Which should you play?
Both. Classic boards are what records and most online rankings use, and learning to guess well is part of that game. No guess boards are the better way to practise logic, and they’re more relaxing when you just want a fair puzzle. Either way, the patterns on the strategy page will make the guesses rarer.