Minesweeper - Free Online Logic Game - Free Online

About the Minesweeper

Minesweeper is the classic logic game that shipped on millions of computers for decades. Hidden mines are scattered across a grid; your job is to reveal every square that is not a mine. Each revealed number tells you exactly how many mines touch that square, and from those numbers you deduce — never guess — which neighbours are safe and which to flag. Your first click is always safe and opens up a whole area to get you started. Three difficulties scale the grid and mine count; the clock is running, so a clean, fast sweep is the goal.

How to play

Pick a difficulty and tap any square — your first click is always safe.
Numbers show how many mines touch that square; blanks open up automatically.
Switch on Flag mode (or right-click) to mark squares you know hold a mine.
Reveal every safe square to win — hit a mine and the round ends.

What it measures

This test focuses on your logical deduction, concentration and pattern recognition. On the Easy 9×9 field, under a minute is a solid time and the best players finish in seconds. Medium and Hard reward patient, systematic flagging over speed.

Why play it

Pure deductive logic — every safe move can be reasoned out from the numbers
Sharpens concentration and pattern recognition under a ticking clock
Endlessly replayable with a fresh random field every game

Did you know?

Minesweeper shipped with Windows 3.1 in 1992 and stayed in Windows for over 20 years, making it one of the most-played games ever.
Its ancestors — Cube and Mined-Out — date back to the early 1980s, before the Windows version made it a phenomenon.
Minesweeper is proven to be NP-complete: deciding whether a given board is consistent is as hard as the toughest problems in computer science.
Expert speedrunners clear the classic 16×30 board with 99 mines in under 40 seconds.

What counts as a good score?

No published norms exist for this format, so the ranges below are practical skill tiers rather than measured population data.

Level	Board completed	What it means
Learning	Beginner (9×9, 10 mines)	Getting comfortable with reading number constraints and flagging confidently.
Solid	Intermediate (16×16, 40 mines)	You are applying the 1-2-1 and 1-2-2 patterns without working them out each time.
Strong	Expert (30×16, 99 mines)	Completing expert boards regularly. This is where most serious players measure themselves.
Expert	Expert under 100 seconds	Fast pattern recognition plus efficient mouse work. World records are under 30 seconds.

Tiers describe the standard board sizes rather than player population data. Competitive Minesweeper records are tracked publicly and sit far below these times.

How to improve your minesweeper score

1.Learn the 1-2-1 pattern

A 1-2-1 along an edge always resolves to mine-safe-mine. Recognising a handful of patterns like this replaces most of your arithmetic.

2.Stop flagging everything

Flags cost clicks and time. Strong players flag only what they need to enable a chord, and track the rest mentally.

3.Use chording

Clicking both buttons on a satisfied number clears its neighbours at once. This is the single largest speed gain available.

4.Work the edges first

Edge and corner cells have fewer neighbours, so their constraints are tighter and resolve sooner.

5.Count the remainder at the end

Late in a board, total mines remaining often forces a deduction that local numbers alone cannot give you.

Minesweeper is NP-complete

Richard Kaye proved in 2000 that determining whether a given Minesweeper configuration is consistent — whether any mine arrangement fits the numbers shown — is NP-complete. He did it by building logic gates out of Minesweeper patterns, showing the board can encode arbitrary Boolean circuits.

The practical consequence is that no efficient general algorithm for the hardest positions is known, or likely. It also means the game genuinely cannot always be solved by logic: some positions force a guess no matter how well you play, which is why even world-class players lose expert boards regularly.

Shipped to teach the mouse

Minesweeper shipped with Windows 3.1 in 1992, and like Solitaire before it, it had a training purpose — Solitaire taught drag-and-drop, Minesweeper taught precise left and right clicking. Both became far more used than anticipated. Microsoft removed it from the default install with Windows 8 in 2012.

Frequently Asked

How do you play Minesweeper?

Reveal squares to uncover numbers. Each number is the count of mines in the eight squares around it. Compare numbers against unrevealed neighbours to work out which must be mines (flag them) and which must be safe (reveal them). A properly played board rarely needs a guess.

Is the first click ever a mine?

Not here. The mines are placed only after your first click, and never on the square you clicked or its immediate neighbours — so your opening move always reveals a safe area to reason from.

What do the numbers mean in Minesweeper?

A number tells you how many of the eight surrounding squares contain a mine. A "1" means exactly one neighbour is a mine; a "3" means three. If a number already touches that many flags, its remaining neighbours are all safe.

Is Minesweeper always solvable without guessing?

No. Some positions are genuinely ambiguous — two arrangements fit the visible numbers equally well — and no amount of logic resolves them. Some modern implementations generate guaranteed no-guess boards; classic ones do not.

What is the fastest expert time?

Competitive records on the standard 30×16 expert board are under 30 seconds. Records are tracked by the Minesweeper community with video verification, since the game is trivially easy to fake otherwise.

What does chording mean?

Clicking both mouse buttons on a numbered cell whose mines are all flagged, which clears every remaining neighbour at once. It is the main technique separating fast players from accurate ones.

Minesweeper - Free Online Logic Game