Bubble Rush is a bubble shooter with a pressure mechanic: you have a limited number of shots before a new row of bubbles descends from the top, so every shot that doesn't pop anything brings the board closer to you.
That constraint changes how you play. In a leisurely bubble shooter you can afford to place a bubble for later; here, a shot that clears nothing costs you.
A new row of bubbles descends after a set number of shots rather than on a timer, so wasted shots directly bring the board closer to the bottom.
Pop the bubbles that support a hanging cluster — everything no longer connected to the ceiling falls and counts.
Yes — tap to aim and fire. Nothing to install.