How to play Deep Signal

Probe a sector to reveal how many of its eight neighbors hide a signal. Use those counts to deduce which sectors are safe and which are mined, then flag the dangerous ones. On desktop, left-click probes, right-click flags, and left-clicking a satisfied number chords its neighbors. On touch, tap to probe and long-press to flag.

Your first probe is always safe and opens a cascade of clear sectors. Clear every safe sector to win. Probe a hidden signal and it overloads — the run is over.

Tips & strategy

• Start in open space; the first-probe cascade hands you the most information for free.
• Chord a number once you've flagged its neighbors to clear sectors in bulk.
• When the counts force a mine's location, flag it immediately to unlock the chord.
• Three difficulties change the grid size and signal density — best times are tracked per difficulty.

Deep Signal is a free minesweeper-style logic puzzle online with no download — read the counts, flag the mines, and beat your best time straight in the browser.