Rows rise from below. Keep every column under the red line.
Tap / click a group of 2+ touching tiles of one colour to clear it (hover or first tap previews it). Bigger groups score far more: 2 tiles = 10, 6 tiles = 150, 10 tiles = 450.
Tiles above fall down, and any column 3+ taller than its neighbour topples sideways. A fall that joins 4+ of a colour cascades automatically, at a rising multiplier.
Bomb ✹ tiles blast a 3×3 when a clear touches them. Stones ▦ can't be picked: they crack when a clear touches them.
Quick back-to-back clears add +10% each (up to +100%). Clears in the top two rows score ×1.5. Raise a row early (R) for bonus points.
Keyboard: arrows move, Enter clears, P pauses. Each colour has its own symbol.