Two-phase aim: tap once to lock the horizontal sweep, tap again to lock the vertical — the dart lands where both bars cross.
A dartboard sits at the top. Below it, a horizontal bar sweeps left-right at a steady speed — tap anywhere to lock its x position. A vertical bar then sweeps up-down; tap to lock its y. The dart lands at the locked (x, y): bullseye 50, inner 25, middle 10, outer 5, miss board 0. A miss costs one life. Three darts per round; after each round the sweep gets faster and a round bonus is added. Run ends when lives reach zero.
Aim for the inner 25 by default, not the bullseye. The 50-point bullseye is tiny and easy to miss completely — a clean run of 25s is worth more than alternating bullseyes and misses. Reach for the 50 only when you have a life to spare and the sweep is slow enough that you can read it.
Watch the sweep direction reversal points. The bar is briefly slowest at each end of its travel — start the tap-press a hair before it reaches your target on the way back, because reaction lag will land the lock right at center as it slows.
Don't try to compensate for tap latency by tapping late. Mobile browsers have surprisingly low input latency for pointerdown — tapping when the bar visually overlaps your target lands very close. Late-tapping pushes the lock past the target every time.
Vertical aim is harder than horizontal. The vertical sweep is the same speed but the board is taller than wide visually, so the same lag costs more zones. Slow down the horizontal phase aim, even if it means you have to ride the bar through one extra cycle.