Minesweeper
Minesweeper is a logic puzzle game where you uncover tiles while avoiding hidden mines using number clues.
Key features
- Classic Minesweeper with multiple difficulty levels
- Left-click to reveal, right-click to flag mines
- Number clues indicate adjacent mine count
- Timer and mine counter for competitive play
Guide
Minesweeper has been part of the personal computing experience since the early 1990s. The version most people know shipped with Microsoft Windows 3.1 in 1992, though the concept predates that release. The earliest ancestor is a 1960s mainframe game called Cube, and a more direct predecessor is Relentless Logic (also called Mined-Out) from 1985 on the Commodore 64. Microsoft included Minesweeper in Windows to help users learn left-clicking, right-clicking, and mouse precision, skills that were novel for many computer users in the early 1990s. Robert Donner and Curt Johnson are credited with the Windows version. The game remained a Windows staple through Windows 7 and was replaced by a Microsoft Store app in Windows 8. The game presents a rectangular grid of covered cells. Hidden beneath the covers are mines and safe cells. Your goal is to uncover every safe cell without detonating any mine. Left-clicking a cell uncovers it. If the cell contains a mine, the game is over. If the cell is safe, it reveals a number indicating how many of its eight neighboring cells (horizontally, vertically, and diagonally adjacent) contain mines. If the cell has zero neighboring mines, it appears blank and all adjacent cells are automatically uncovered in a cascade, since they are guaranteed safe. Right-clicking a cell places a flag, marking it as a suspected mine. Flags are visual aids and prevent accidental clicks. Standard board sizes follow three presets. Beginner is 8x8 or 9x9 with 10 mines. Intermediate is 16x16 with 40 mines. Expert is 30x16 with 99 mines. The mine density determines difficulty: beginner has roughly 12 to 15 percent mines, intermediate has about 15.6 percent, and expert has about 20.6 percent. Custom boards allow any dimensions and mine counts. Higher mine density increases the likelihood of ambiguous situations where logic alone cannot determine whether a cell is safe. The first click in modern Minesweeper implementations is always safe. The game generates the mine layout after your first click, ensuring that the clicked cell and usually its neighbors are mine-free. This guarantees that every game starts with usable information. Older implementations generated mines before the first click, meaning it was possible to die on the very first click. Browser versions almost universally use the safe-first-click approach. Reading numbers is the foundational skill. A cell showing 1 has exactly one mine among its eight neighbors. A cell showing 2 has exactly two. And so on up to 8 (extremely rare, meaning every surrounding cell is a mine). The key insight is that numbers constrain each other. A 1 in the corner of the board has only three neighbors, so the mine must be one of those three. A 1 in the middle of the board has eight neighbors but the mine must still be exactly one of them. When the numbered cells surrounding a covered cell collectively provide enough information, you can determine with certainty whether the covered cell is a mine or safe. The simplest logical pattern is the satisfied number. If a numbered cell has exactly that many flagged neighbors, all remaining covered neighbors are safe and can be uncovered. For example, a 2 with two adjacent flags has its mine count satisfied. Any other covered neighbors can be safely clicked. Chord clicking (middle-click or simultaneous left-right click on a satisfied number) uncovers all remaining covered neighbors at once. Chord clicking is the primary speed technique in competitive Minesweeper. The second basic pattern is the forced mine. If a numbered cell has only as many covered neighbors as mines remaining (mines minus flags), all covered neighbors must be mines. For example, a 3 with one flag and two covered neighbors must have mines in both covered cells. Flag them immediately. Alternating between these two patterns, satisfied numbers and forced mines, solves a large portion of every board. The 1-1 pattern is the first intermediate technique. When two adjacent 1-cells share neighbors, and one of the 1-cells has a covered neighbor that the other does not share, that unshared neighbor is safe. This works because the mine that satisfies one 1 is in the shared region, leaving the unshared region clear. Variations of this pattern extend to 1-2, 2-1, 1-3, and other number combinations. These reduction patterns account for much of the logical deduction in Minesweeper. The 1-2 pattern along an edge is critical. If a 1 and a 2 are adjacent along the border of the board or along a cleared area, the mine configurations are tightly constrained. The 1 indicates one mine in its covered neighbors. The 2 indicates two mines in its covered neighbors. The shared and unshared neighbors interact to force specific mine placements. Learning to read these edge patterns quickly separates intermediate players from beginners. Counting remaining mines provides global information. The mine counter at the top of the board shows total mines minus flags placed. When the board is nearly solved, this count constrains distant regions. If 3 mines remain unflagged and there are exactly 3 covered cells, all must be mines. If 0 mines remain, all covered cells are safe. In less extreme cases, knowing the total mine count helps resolve ambiguous regions by process of elimination. Probability assessment becomes necessary when logic reaches its limits. Some board configurations are genuinely ambiguous: two or more mine arrangements satisfy all visible numbers equally well. In these cases, the best you can do is click the cell with the lowest probability of being a mine. Corner and edge cells tend to have lower mine probability in ambiguous situations because they have fewer neighbors and thus fewer configurations that place a mine there. Experienced players develop intuition for these probabilities through thousands of games. Speed techniques for competitive Minesweeper include flag efficiency, chord clicking, and NF (no-flag) style. In NF play, you never right-click to place flags. Instead, you left-click all safe cells directly, relying on mental tracking of mine locations. This eliminates half the clicks (the flagging clicks) but requires you to remember mine positions without visual aids. The world record for expert difficulty is under 30 seconds using NF technique. Chord clicking (also called double-clicking) is performed by clicking both mouse buttons simultaneously on a satisfied number. This uncovers all unrevealed neighbors at once. Efficient chord clicking dramatically reduces the total number of clicks needed to clear a board. The fastest Minesweeper players alternate between flagging and chording in rapid sequences: flag a mine, chord the adjacent satisfied number, flag the next mine revealed by the chord, chord again, creating a chain reaction across the board. Board analysis at the start of a game follows a standard pattern. Click near the center (or wherever you prefer) to generate the opening cascade. Scan the edges of the opened area for forced mines (numbers equal to their covered neighbor count). Flag those mines. Then scan for satisfied numbers and chord them. This process cascades outward from the initial opening. Continue scanning the new frontier of numbers and covered cells until no more deterministic moves remain. When you reach a point where no deterministic move exists, you must choose a cell to click based on probability. Beginners often click randomly in these situations, but better play involves analyzing the constraints. Count how many mine configurations are possible in the ambiguous region. The cell that appears as a mine in the fewest configurations has the lowest mine probability and is the safest click. In a 50/50 situation (two cells, exactly one mine, no way to determine which), the game is genuinely down to luck. Keyboard controls in browser Minesweeper vary by implementation but common mappings include: left-click to uncover, right-click to flag/unflag, middle-click or spacebar to chord. Some versions use F to flag and spacebar to uncover. Arrow keys may navigate between cells for keyboard-only play. Speed players prefer mouse-only control because mouse movement between cells is faster than keyboard navigation. Browser Minesweeper advantages over the classic Windows version include customizable board sizes, statistics tracking, replay functionality, and analysis tools that show which moves were logically deducible versus probabilistic guesses. Some implementations color-code cells to indicate which moves were forced by logic and which were guesses, helping you learn to identify patterns you missed. Win rates vary by difficulty and skill level. Beginner boards have nearly 100 percent win rate for experienced players because the low mine density rarely produces ambiguous situations. Intermediate boards are winnable about 75 to 85 percent of the time with good technique. Expert boards have win rates of 25 to 40 percent for strong players, limited primarily by unavoidable 50/50 guessing situations. No amount of skill can guarantee a win on expert because some board configurations are provably ambiguous. Common beginner mistakes include clicking randomly when unsure (instead of analyzing probabilities), not using chord clicking, placing flags on every suspected mine instead of focusing on cells that enable chords, and neglecting the global mine count. Another frequent error is tunnel vision: focusing on one region of the board while ignoring easier deductions elsewhere. Always scan the entire frontier before committing to a guess. Practice recommendations for improvement: start on beginner boards and solve 50 games to internalize the basic patterns. Move to intermediate and play 100 games, focusing on consistent application of the 1-1 and 1-2 patterns. Then advance to expert and focus on board-reading speed and probability estimation for ambiguous situations. Track your win rate and average time. A sub-100-second expert time is a solid intermediate milestone. Sub-60 seconds indicates strong play. Sub-40 is competitive level.
Frequently asked questions
How do you play Minesweeper?
Click tiles to reveal them. Numbers show how many mines are adjacent. Use logic to flag all mines without detonating any.
What difficulty levels are available?
Beginner (9x9, 10 mines), Intermediate (16x16, 40 mines), and Expert (30x16, 99 mines).
