Minefield Logic

Rules and objective

Reveal every safe cell to win; flags are optional notes, not a second win condition. A number counts mines in all eight neighbouring cells, including diagonals. The first revealed cell and its neighbours contain no mines. Empty areas open together. Revealing a mine ends the round, and the result shows the mines so you can inspect your mistake.

Controls

Click or tap to reveal. Select Flag to mark or unmark a covered cell; right-click or press F on a focused cell also toggles its flag. Arrow keys move through the board; Enter or Space uses the selected mode. A second reveal on an open number clears its unflagged neighbours when the number of adjacent flags matches the clue. Incorrect flags can therefore trigger a mine. Large fields scroll inside the board: swipe or use the focused cell and arrow keys. Controls outside the board remain in place.

Difficulty and replay

The Campaign contains 30 fixed 9×9 boards with a prepared safe opening. Clear every safe cell to unlock the next stage; unlocked stages can be replayed. Stages 5, 10, 15, 20, 25, and 30 close their arcs with higher mine counts. Quick Puzzle keeps random Easy 9×9, Medium 16×16, and Hard 16×30 boards.

Logical hints

Hints use revealed numbers, the total mine count, direct deductions and subset comparisons. They do not assume your flags are correct, inspect hidden answers, or open cells for you. A hint may identify a safe cell, a mine to flag, or a demonstrably incorrect flag. When the implemented deductions cannot prove a move, the game says so; this is not proof that no deeper deduction exists. Undo restores the previous reveal, chord or flag, including recovery after a mine. Hint and Undo mark the entire round as assisted.

Local records

This browser saves the highest unlocked stage, cleared stage IDs, Quick Puzzle difficulty, shared preferences, and best unassisted times. Campaign layouts stay fixed on replay. An unfinished board is not saved; clearing browser data removes these local records.

Practical tips

Start by reading the boundary of an open area, including diagonal neighbours. If a 1 touches just one covered cell, that cell is a mine. Compare overlapping numbers before using a flag. A matching flag count makes a number clickable, but does not prove your flags correct. Use Undo to understand a mistake rather than repeatedly guessing the same cells.

Design note

Minefield Logic separates a readable board from its navigation. Large fields scroll inside the play area while the actions remain available. Hints propose a proven action rather than playing it automatically, so you can inspect the highlighted clues. Unassisted best times reward a clean solution; assisted rounds remain useful for exploring deductions without claiming a competitive record.

Questions about this field

Must I flag every mine?

No. You win by opening every safe cell. Flags are optional notes, and the remaining-mine counter is only the total minus the flags you placed. It does not validate those flags.

Can the first move lose?

The first revealed cell and all of its existing neighbours are protected. This creates a safe opening, but it does not guarantee that every later decision is solvable without guessing.

Why does Hint sometimes find nothing?

The helper checks visible numbers and the total with direct and subset deductions. No result means that this helper found no proof, not that guessing is certainly required or that the puzzle is impossible.

Does Undo qualify for a best time?

No. Using Hint or Undo marks the whole round assisted, even after undoing back to the opening. You can still finish normally, but only unassisted wins update the local best time.

Similar gameplay reference

Microsoft Minesweeper also uses number clues and mine marking. Minefield Logic adds 30 authored, fixed campaign boards with local unlock and replay, while retaining random-size Quick Puzzle, visible-evidence Hint, and Undo. These are separate games; this comparison does not imply affiliation.