- Difficulty
- Expert
- Time
- 00:00
- Mines
- 70
The opening is pre-cleared. Tap to reveal, switch to Flag on touch screens, or right-click to flag. Swipe horizontally to move across the larger field.
The safe opening is ready. Follow the numbered clues.
expert Minesweeper
Carry subset deductions across a deep field.
Expert Minesweeper keeps the classic goal: reveal every safe square while using each number as the exact count of adjacent mines. The board shown here measures 20 × 20 with 70 mines and begins from a fixed safe opening.
This example is designed for about 18 minutes. Before publication, the solver completed it in 146 single-clue and subset deductions, so the intended path does not depend on a lucky first click or a forced random guess.
Treat each clue as a small constraint and compare nested groups along the full open boundary. Expert boards often require several safe reveals before the original cluster becomes decisive.
Reveal and Flag modes make touch input explicit, while Undo and Hint preserve the reasoning loop. An incorrect reveal stays covered instead of ending the run, and the full board state is stored locally if you pause or leave the page.
Common questions
What makes this Minesweeper expert?
The 20 × 20 field contains 70 mines and requires 146 verified deductions after its safe opening. The rating reflects board scale and logical depth.
How should I approach an expert board?
Treat each clue as a small constraint and compare nested groups along the full open boundary. Expert boards often require several safe reveals before the original cluster becomes decisive.
What should I do when every move looks uncertain?
Audit all current flags, isolate two overlapping groups, and subtract their remaining mine counts. If they do not yield proof, move to another boundary rather than estimating risk.
Can this board require a guess?
No. The published starting position was verified with deterministic single-clue and subset deductions. A logical next move exists even when it appears on another part of the open boundary.