Minesweeper Number Patterns

Patterns depend on the covered squares

A number sequence is useful only when you know which covered squares touch each clue. Edge position and already confirmed flags matter. Do not memorize a row of numbers alone; compare the exact neighboring cells and subtract mines you have already identified.

Before naming a sequence, list the exact covered neighbors of each number. Two rows can look similar while one extra covered square changes the deduction. Corners and gaps are especially likely to break a familiar pattern.

The 1-2-1 edge pattern

Along a straight edge, a 1-2-1 sequence can identify the covered squares on either side of the middle clue as mines and the square between them as safe, when all three clues share the expected two-row pattern. Check the board shape before applying the deduction.

The common edge 1-2-1 deduction works when the three clues share the expected line of three covered squares: the outer positions are mines and the middle position is safe. Rotate or mirror the layout only when the neighbor geometry still matches.

The 1-2-2-1 edge pattern

On the familiar two-row edge pattern, 1-2-2-1 can show that the two outer covered squares are safe while the two inner ones contain mines. The pattern assumes a clear straight edge and no other open or flagged squares changing each clue’s neighbors.

Check the board shape before using a pattern

The familiar 1-2-1 and 1-2-2-1 patterns depend on which covered squares each number actually touches. A gap, corner, or extra open square can change that relationship. Trace the neighboring covered cells and subtract confirmed mines before applying a remembered pattern.