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About Minesweeper

Minesweeper is the deduction puzzle that came pre-installed on Windows for three decades, turning millions of people into logic puzzle enthusiasts whether they knew it or not. The grid hides a fixed number of mines. Click any square to reveal it — if it's safe, a number appears showing how many of the eight adjacent cells contain mines. Zeros reveal automatically, opening up large safe regions. Use those numbers to deduce which squares are safe and which hide mines. Reveal every safe square without clicking a mine to win.

Minesweeper was created by Curt Johnson and Robert Donner at Microsoft in 1990, originally as a way to teach users mouse control for the new Windows 3.1 interface. Its genius was accidental — the underlying puzzle turns out to be deeply satisfying, combining logical certainty with calculated risk. Most of the board can be solved through pure deduction; a small number of positions are genuinely ambiguous and require a guess. That tension between certainty and chance is what makes the game compelling.

The game has three standard difficulty levels: Beginner (9×9 grid, 10 mines), Intermediate (16×16, 40 mines), and Expert (30×16, 99 mines). Expert play is a fully developed skill. The world record for Expert mode is 25.10 seconds, set by Ze-En Ju — a time that requires not just logical speed but memorized opening patterns and near-instant pattern recognition for common configurations like the 1-2-1 and 1-2-2-1 formations.

In 2000, computer scientist Richard Kaye proved that Minesweeper is NP-complete — a position in the game can encode any instance of the Boolean satisfiability problem. This makes it one of the few games with a direct connection to fundamental computer science theory. Whether you're playing casually or chasing speedrun records, the logic and the risk are always present in equal measure.

Key Features

  • Three difficulty tiers — Beginner (9×9, 10 mines), Intermediate (16×16, 40 mines), and Expert (30×16, 99 mines)
  • Guaranteed safe first click — the first revealed square is always a zero or number, never a mine
  • Flag system — right-click to mark suspected mines and track your deductions
  • Chord clicking — reveal all safe neighbors of a numbered cell at once once it's fully flagged
  • Pure logic puzzle — the vast majority of the board is solvable by deduction with no guessing required
  • Speedrun-friendly — timer starts on first click for personal best tracking

Controls

Left Click — reveal a square
Right Click — place or remove a flag on a suspected mine
Middle Click (or Left + Right Click simultaneously) — chord: auto-reveal all unflagged neighbors of a satisfied number
MobileTap to reveal a square; long press to place a flag

How to Play

  1. 1Select a difficulty: Beginner, Intermediate, or Expert. The timer starts on your first click.
  2. 2Left-click any square to reveal it. The first click is always safe — it will open a region, never a mine.
  3. 3Revealed numbers show how many mines are hidden in the eight adjacent squares. A blank square has zero adjacent mines.
  4. 4Right-click squares you believe contain mines to flag them. Use flags to track your deductions.
  5. 5Use number clues to deduce which unrevealed squares are definitely safe, then click those.
  6. 6Win by revealing every non-mine square. The game ends immediately if you click a mine.

Tips & Tricks

  • Learn the 1-2-1 and 1-2-2-1 patterns before Expert play. These are the most common configurations and once recognized instantly they alone solve a large portion of every board.
  • The 1-2-X edge pattern: a '1' and '2' aligned along a wall, with the '2' adjacent to an unknown square — the unknown square bordering only the '2' and not the '1' is always a mine.
  • When stuck, count remaining mines against unconstrained squares. If the remaining mine count equals the unconstrained square count in a region, all of them are mines.
  • On Expert, open near the center rather than a corner. Center opens are statistically more likely to open large regions, clearing more of the board from a single click.
  • Accept that a small number of positions require a 50/50 guess. When you reach a genuine coin-flip, make the choice quickly and move on — dwelling doesn't change the odds.

Game Info

DeveloperCurt Johnson & Robert Donner / Microsoft (original, 1990)
Release Year1990
PlatformBrowser
TechnologyHTML5 / JavaScript

FAQ

Yes — all Minesweeper implementations guarantee the first click is safe. The mine layout is generated after your first click to ensure you never detonate on the opening move.

Beginner is 9×9 with 10 mines, Intermediate is 16×16 with 40 mines, and Expert is 30×16 with 99 mines. These have been the standard since the original Windows 3.1 version.

Mostly yes. The vast majority of positions have a definitive logical solution. However, some board configurations create genuine 50/50 situations where a guess is unavoidable. These are rare on Beginner and more common on Expert.

The verified world record for Expert mode is 25.10 seconds, set by Ze-En Ju. Top players use pattern memorization and chord-clicking to clear boards at near-automated speeds.

Computer scientist Richard Kaye proved in 2000 that determining whether a partial Minesweeper board has a consistent mine configuration is NP-complete — meaning it's computationally equivalent to the hardest class of logical decision problems.

Chord-clicking on a numbered square (when the correct number of adjacent squares are flagged) automatically reveals all remaining unflagged neighbors. It's the fastest way to clear large areas once mines are identified.