Today's Best — Expert

#	Name	Time	Board	Mines	3BV	3BV/s	Eff	Date	Board
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Welcome to Lady Di's Mines

Minesweeper.org has been serving the classic Minesweeper game since 2000. Play beginner, intermediate, expert, or custom boards — all free, no download required. Challenge yourself against the daily leaderboard or set a personal best.

Expert Minesweeper — 30×16, 99 Mines

Expert is the definitive Minesweeper benchmark. The board is 30×16 with 99 mines — a mine density of roughly 20.6%, nearly double that of Beginner. There are no easy opening cascades, no forgiving empty regions to explore. Every area of the board is constrained, every number is a clue that requires immediate attention. This is where the game gets serious.

World-class players finish Expert in under 40 seconds. Sub-100 seconds is a common intermediate milestone. If you're new to Expert, expect your first clears to take several minutes — and expect to lose often. Learning to read the board at expert density takes time, but the pattern recognition that develops is what separates casual players from serious ones.

What Makes Expert Hard

High mine density everywhere. At 20.6%, there are few zero-cells. Almost every reveal produces a number. The board never opens up the way it does at lower difficulties.
Simultaneous constraint solving. Expert boards regularly present configurations where three, four, or five numbered cells share unknown neighbors. Reading these patterns quickly — and correctly — is the core skill.
Speed pressure. Expert rewards efficient clicking patterns. Players who score sub-60s have internalized the common patterns so thoroughly they process them in fractions of a second.
More frequent guesses. Even on No Guess boards, expert-density layouts produce more constrained chains. Without No Guess, some boards contain unavoidable 50/50s — the only variable is when they appear and whether they're fatal.

Expert Strategy

Start with any opening. Your first click is safe anywhere. Many Expert players click a corner — smaller initial cascade, but immediately into constrained territory where you can start reading.
Recognize patterns instantly. The 1-2 pattern, 1-2-1, 1-2-2-1, isolated corners, completed constraints — at Expert speed, pattern recognition must be automatic. Study them explicitly.
Minimize flags, maximize chords. Top Expert players often use a "flag as you go" or even "no flag" approach, chording through revealed constraints without stopping to right-click every mine.
Scan, don't read. Don't analyze one cell at a time. Train your eyes to scan a region for completed constraints (number equals flagged neighbors) so you can chord through multiple cells in one sweep.
Accept the guesses. On non-No-Guess boards, unavoidable 50/50s are part of Expert. A good time with a bad guess is not a failure — it's variance. Chase consistent deduction across the board and let the odds work over time.

Expert 3BV and Statistics

Expert boards typically have a 3BV (minimum click count) between 100 and 200. Your 3BV/s (3BV per second) and efficiency (3BV divided by actual clicks) appear in the leaderboard — they measure the quality of your play beyond raw time. A fast time with low efficiency means lots of wasted clicks. High efficiency with a slow time means clean technique, not yet at peak speed.

The leaderboard above shows today's best Expert scores. Scores include both standard and No Guess modes — check the toggle above the board to switch.

Learn more about 3BV →

Expert Variants

Cylinder Expert — 30×16, 99 mines, with left and right edges connected. The wrap creates deduction chains that span the full width of the board.
Toroid Expert — All four edges connect. No corners, no edges — every cell has exactly eight neighbors.
Hexsweeper Expert — Expert-density play on a hexagonal grid. Six neighbors per cell instead of eight changes the math fundamentally.
Worldsweeper Expert — Minesweeper on a 3D globe. Expert density distributed across the surface of a sphere.

Minesweeper Expert — 30×16, 99 Mines