drain every bubble to zero before it reaches your base
TOPMIDBOT
1 · ROUTE
Steer bubbles through 3 gates. Detours pass more towers.
−1÷2
2 · REDUCE
Place operator towers. Each path cell they cover = a hit.
0
3 · ZERO
Hit exactly 0 and the bubble pops. Anything left at the base costs 1 HP.
Every bubble shows where it will land on the current route — switch gates to steer it onto 0. Hit the bonus target (shown up top) for gold and a healed heart. Build and sell towers between waves, with the next wave's numbers shown. Survive 5 waves to level up.
Keys — gates: QWE / ASD / ZXC · Space start wave · F turbo