Whack‑a‑mole, gone fishing.
Every bobber has a key (or tap a spot).Tap a bobber to strike. Ripples mean a fish is sniffing; when the bobber plunges, strike its keytap it. Striking during the ripples scares it off, an empty spot splashes −2, and the old boot isn't worth hooking (−5). Five catches in a row double your points; ten triple them. On the whole keyboard, when a number's tag turns gold and shows its symbol (! % &…), only Shift + that key hooks it.