Four lanes of notes fall toward the line — tap a lane (or use ← ↑ ↓ →) as its note crosses. The closer to the line, the more it pays: PERFECT 600, GREAT 350, OK 150, plus a combo bonus and +2,500 every 25th hit. Late notes and stray taps drain your SYNC meter; hits refill it. When SYNC hits zero the run is over.