Aim, fire, and match three to pop the wall before it reaches the bottom.
Drag to aim — bank shots off the side walls. Release to fire. Match 3 or more of a colour to burst them, and anything left hanging drops too. Tap ⇄ (or press S) to swap your next bubble.
Bomb — earned on a 5+ burst, blows a hole in any colour
Rainbow — counts as whichever colour it lands against
Stone — can't be matched. Drop it or bomb it