Minesweeper

Minesweeper is often misunderstood as a game of luck punctuated by cruel coin flips. In standard implementations from early operating systems, mines were scattered across the board at random. While the opening click might be protected, players frequently reached endgames where two hidden squares each had an equal 50% probability of containing the final bomb.

This implementation eliminates guesswork entirely. Every board is evaluated by an automated deductive engine before you make your second move, guaranteeing that every safe cell and every mine can be deduced with 100% certainty from the visible clues.

Opening Safe Zones

Your very first click is always guaranteed to land on a zero. Mines are positioned only after you touch the board, strictly excluding your chosen square and all eight of its adjacent neighbours. This immediately triggers an opening cascade, giving you an informative shoreline of numbers to work with rather than an isolated digit.

Core Logical Patterns

Mastering Minesweeper relies on recognizing local set relationships along the boundary between revealed numbers and hidden tiles.

• The 1-2-1 Wall: When you encounter numbers reading 1-2-1 along a straight wall of unopened squares, the two squares directly adjacent to the ones are always mines, while the square directly opposite the center two is always safe. The two requires two mines across three available spaces; since each flanking one can claim at most one mine from the two’s span, the outside squares must contain both mines.
• The 1-2-2-1 Pattern: Along an unbroken flat border, a 1-2-2-1 sequence always harbors mines beneath both twos, while the squares beneath both ones are guaranteed safe.
• Set Difference and Subsets: When cell A has two hidden neighbours that are a strict subset of cell B’s three hidden neighbours, the difference between their numbers dictates whether the excess square is a mine or safe. If B minus A equals one and there is only one excess square, that square is unconditionally a mine.

Fast Play with Chording

Once you have flagged the correct number of mines around a numbered square, activating that number again—by clicking it or pressing Space—chords the cell, instantly opening all remaining unflagged neighbours. If all your flags are correct, chording shaves seconds off your completion time. If any flag was misplaced, the chord will strike the concealed mine, making disciplined flagging essential for high-speed runs.

Controls

Arrow keys	Move the cursor.
Enter or Space	Reveal the active cell or chord an already-revealed number.
F	Toggle a flag on the active cell.
Left click / Tap	Reveal a hidden cell or chord a revealed number.
Right click	Toggle a flag on a cell.
Long press	Flag or unflag a cell on touch screens.