Bubble Shooter Deluxe is the endless version of the format: no levels and no goals, just a board that keeps descending and a score that keeps climbing until you can't clear fast enough.
That makes it the purest expression of the game. Every shot is judged only on how much it clears, and the run ends when the maths finally beats you.
No — it's endless. The board descends and the run continues until the bubbles reach the bottom of the screen.
Prioritise clearing height over scoring. Dropping large sections keeps the board shallow, which buys you far more time than popping matches at the top.
Yes — a very light game with nothing to install.