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What Is Minesweeper?

Minesweeper is one of the most iconic logic puzzles in computing history. The game presents you with a rectangular grid of hidden cells. Beneath some of those cells lurk mines — your job is to reveal every safe cell without detonating a single one.

When you reveal a cell, it shows a number indicating how many of its eight neighbouring cells contain mines. A blank cell (0 mines nearby) automatically expands to reveal its safe neighbours. Using these numbers as clues, you logically deduce which cells are mined and mark them with flags. The game is won when every non-mine cell has been revealed.

How to Play Minesweeper

1. Reveal a cell. Click or tap any cell to uncover it. Your first click is always safe — mines are placed after your first move.
2. Read the numbers. A revealed cell shows how many of its 8 neighbours are mines. Use these counts as clues to figure out where the mines are.
3. Flag suspected mines. Right-click (desktop) or long-press (mobile) to place a flag on a cell you believe is a mine. You can also toggle Flag Mode to tap-to-flag.
4. Use logical deduction. If a "1" cell has only one hidden neighbour, that neighbour must be a mine. If all mines around a number are flagged, the remaining hidden neighbours are safe.
5. Clear the board. Reveal every safe cell to win. If you reveal a mine, the game is over.

Minesweeper Grid Sizes

This version offers three grid sizes designed to be mobile-friendly:

• Small (9×9, 10 mines) — The classic beginner grid. Great for quick games and learning the mechanics. About 12% of cells are mined.
• Medium (12×12, 25 mines) — A balanced challenge that fits comfortably on any phone screen. About 17% mine density.
• Large (16×16, 40 mines) — The classic intermediate grid. Serious challenge with roughly 16% mine density. May require scrolling on smaller screens.

The classic "Expert" difficulty (30×16 with 99 mines) is deliberately omitted because a 30-column grid doesn't display well on mobile devices. The 16×16 large grid provides plenty of challenge while remaining playable on phones and tablets.

Minesweeper Strategy & Tips

1. Start From Corners and Edges

Corner cells have only 3 neighbours and edge cells have 5, compared to 8 for interior cells. This means the numbers on the edge give you more information per cell. Clicking near a corner on your first move often opens up a large area because there are fewer potential mine positions.

2. Master the Basic Patterns

The most fundamental pattern: if a number equals the count of hidden cells around it, all those hidden cells are mines. Conversely, if a number equals the count of flags around it, all remaining hidden neighbours are safe — click them all. These two rules alone will solve a huge portion of any Minesweeper board.

3. Learn the 1-2 Pattern

When you see a "1" and "2" next to each other along a wall of hidden cells, the mine is always next to the "2" (on the side away from the "1"). This pattern and its variants (1-2-1, 1-2-2-1) are the bread and butter of intermediate and advanced Minesweeper play.

4. Cross-Reference Multiple Clues

Don't look at numbers in isolation. Compare adjacent clues to narrow down possibilities. If a "2" cell already has one flag next to it, it effectively becomes a "1" for the remaining hidden cells. Chain these deductions together to solve complex situations.

5. Count Remaining Mines

Keep an eye on the mine counter. Toward the end of a game, knowing exactly how many mines remain unflagged can make certain deductions straightforward. If only two mines remain and you can see three isolated hidden cells, at least one of them must be safe.

6. When You Must Guess, Guess Smart

Sometimes Minesweeper positions are genuinely ambiguous. When forced to guess, choose cells with the lowest probability of being mines. Cells near existing numbers with many mines already accounted for are generally safer. Corner and edge cells of unrevealed areas are usually better guesses than interior cells.

A Brief History of Minesweeper

Minesweeper's roots trace back to the 1960s and mainframe games like "Cube" and other grid-deduction puzzles. The modern version most people know was created by Robert Donner and Curt Johnson at Microsoft and included with Windows 3.1 in 1992.

Microsoft originally bundled Minesweeper (along with Solitaire) to teach users mouse skills — specifically left-clicking, right-clicking, and precise targeting. The strategy worked: Minesweeper became one of the most-played games in history, with hundreds of millions of players worldwide.

Over the decades, a competitive Minesweeper community has flourished. World records for the classic difficulty levels are astonishingly fast — under one second for Beginner, around seven seconds for Intermediate, and roughly 30 seconds for Expert. The game has also been the subject of academic study, including the famous proof that determining whether an arbitrary Minesweeper position is solvable is NP-complete.

Minesweeper was removed from default Windows installations starting with Windows 8 in 2012, replaced by a Microsoft Store app. But the classic game lives on through browser versions like this one, keeping the tradition of logical mine-clearing alive for new generations of players.

Minesweeper and Logic

At its core, Minesweeper is a constraint-satisfaction problem. Each number on the board is a constraint: "exactly N of my neighbours are mines." Playing well means finding cells where these constraints overlap to produce certain deductions.

This makes Minesweeper an excellent exercise in logical reasoning and probability estimation. Researchers have shown that the general problem of determining whether a Minesweeper board has a consistent solution is NP-complete — meaning it belongs to the same complexity class as the infamous Travelling Salesman Problem.

Despite this theoretical difficulty, most boards encountered during play can be solved (or nearly solved) with human-level logic. The rare ambiguous positions are what make the game both frustrating and fascinating — they're the reason why truly perfect play requires a touch of luck alongside a lot of skill.

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