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Signal Sweep

Signal Sweep is a modern Minesweeper game with classic presets, a dense Master challenge, safe first reveals, deterministic fields, flood clearing, flags, chord play, local resume, and keyboard, mouse, and touch controls.

How to play

Clear every cell that is not a mine. Click or tap a hidden cell and its number counts the mines among its eight neighbors, diagonals included; a zero opens its neighbors automatically. Flag cells you are sure hide a mine, and Mines left drops by one. Example: a 1 with exactly one hidden neighbor means that neighbor is a mine. Reveal a number again once it has that many flags around it, and its remaining neighbors open together. Hitting a mine ends the field.

Controls

KeyboardMouseTouch

Tips for this game

Make your first reveal near the middle. It always opens a zero, clearing at least nine cells from the center but as few as four from a corner, so you get more numbers to read.
Before chording a number, recount the flags around it. A chord trusts every flag, so one wrong flag opens a real mine and ends the field. Remove any flag you doubt first.
Learn the 1-2-1 row. When a 1, 2, 1 in a line touch exactly three hidden cells in a row, the outer two hidden cells are mines and the middle one is safe.

Common questions

Can my first click hit a mine, and will I ever have to guess?

Your first reveal cannot hit a mine: that cell and all its neighbors are kept mine-free. After the opening, some fields may still force a guess. Signal Sweep does not promise that every field can be solved by logic alone.

Which difficulty should I pick?

Standard is the default: 9 x 9 with 18 mines. Beginner uses the same grid with 10 mines. Intermediate is 16 x 16 with 40, Expert is 30 x 16 with 99, and Master keeps that grid with 130 mines.

How do I place flags on a phone?

Switch Tap action from Reveal to Flag, then tap hidden cells to flag or unflag them. A stationary long press also flags. Moving your finger cancels it, so you can still scroll the wider Expert and Master boards.

Is there undo, and is my progress saved?

There is no undo or hint. After a mine, the full board stays visible for review. Your current field and statistics are saved on this device, so reloading resumes it. The timer pauses while Help, Statistics or Settings is open.