No-Guess Minesweeper
Every board can be cleared by logic alone. No 50/50s, no coin flips, no losing to luck.
Click to reveal, right-click or long-press to flag. Click a number whose mines are flagged to open all its neighbours. Space flags the cell under the mouse, F2 starts a new game.
Minesweeper Without the Coin Flip
Classic Minesweeper deals mines at random, and a random layout sometimes leaves two cells that no number on the board can tell apart. Every experienced player knows the feeling: four minutes into an Expert game, one mine left, two hidden squares and nothing to go on. Whatever you click, it is a coin toss, and half the time a perfect game ends on bad luck.
No-guess Minesweeper removes that ending. When you make your first click, the game deals a board around it and plays it through with a solver before you see a single number. If the solver can clear the whole board with deductions a player could make, the board is yours. If at any point it would have to guess, the board is discarded and dealt again. On Expert that usually takes a couple of dozen deals, which still happens in a few milliseconds.
What "Solvable by Logic" Means Here
The solver only knows what you know: the numbers that are showing, the cells that are proven mines and the total mine count. It uses the same three ideas that clear most real boards:
- Count the hidden cells. If a number has exactly as many hidden neighbours as mines it is still missing, every one of them is a mine.
- Count the flags. If a number already has all its mines flagged, its other neighbours are safe. Click the number to open them all at once.
- Compare neighbouring numbers. When one number's hidden cells are a subset of another's, the difference between the two numbers tells you about the cells only the second one touches. That single rule is behind the 1-1 and 1-2-1 patterns in the Minesweeper pattern atlas.
At the very end it also counts mines globally: if the mines you have not found equal the cells you have not opened, they are all mines, and if none are left, everything is safe. A board passes only if those rules alone open every safe cell.
Why Players Switch to No-Guess
It changes what a loss means. On a random board a loss might be your mistake or might be the board's. On a no-guess board it is always yours: there was a safe cell somewhere and a deduction that proved it. That makes no-guess the best way to practise, because every loss points at a pattern you missed, and the how-to-play guide walks through each of them on an interactive board.
It is also kinder to long games. Intermediate and Expert are where forced guesses show up most, and those are the games that take the longest to play. With no-guess on, a five-minute Expert run never ends on a coin flip in the last ten seconds.
Controls
Left-click reveals and right-click flags. Click a revealed number whose mines are all flagged to open its remaining neighbours in one go, the move known as chording. With a mouse, Space flags the cell under the pointer and F2 starts a new board. On a phone, long-press to flag or switch the Dig/Flag toggle under the board to flag with a single tap.
Prefer the classic random deal? Untick No-guess mode under the board, or play classic Minesweeper online. The daily challenge stays a shared random board so everyone plays the same layout.
No-Guess Minesweeper FAQ
- What is no-guess Minesweeper?
- A version of Minesweeper where every board is guaranteed to be solvable by deduction from your first click. Before you see the board, a solver plays it using only the information a player would have. If it ever has to guess, the board is thrown away and a new one is dealt.
- Is no-guess Minesweeper easier?
- It is fairer rather than easier. The mine count and board sizes are the same as classic Minesweeper, so Expert still has 99 mines on a 30x16 grid. What disappears is the forced 50/50 at the end of a long game. Some no-guess boards need a deeper pattern, such as 1-2-1 or a mine-count argument, to stay solvable.
- Which logic does the solver use?
- Three rules a human uses constantly: a number with exactly as many hidden neighbours as missing mines has all of them as mines; a number whose mines are all flagged makes its other neighbours safe; and the subset rule between two neighbouring numbers, which is what solves 1-1 and 1-2-1 patterns. Once the frontier runs dry it also uses the total mine count.
- Does no-guess mode work on every difficulty?
- Yes. Beginner, Intermediate and Expert all deal no-guess boards. Generating them takes a few milliseconds even on Expert, so there is no waiting after your first click.
- Can I turn no-guess mode on for the normal game?
- Yes. Tick "No-guess mode" under any board on the site. The setting is remembered in your browser, so the next visit deals no-guess boards too until you untick it.
- Are my times on no-guess boards comparable?
- They are recorded with your normal best times. Because no-guess boards never end on a coin flip, your win rate will be higher and your best times are a better measure of reading speed than of luck.