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. The darker green band around the edge of the board is not a scoring ring — a dart there, or off the board, is a miss: 0 points and one life lost. Three darts per round; after each round the sweep gets 10% faster and a round bonus (30 × round) is added, unless that round's last dart cost your last life. 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.
Don't wait for the ends. The bar moves at one constant speed and bounces back instantly at each end of its track — there is no slow spot to exploit. Pick a landmark on the track under your target and tap as the bar passes it, in either direction.
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.
Treat the edge of the lighter green 5 ring as the real edge of the board. The darker band outside it is drawn but scores nothing and costs a life, so a dart that looks like it hit the board can still be a miss. Both bars travel at the same speed; the vertical track is just slightly shorter than the horizontal one, so it turns around a little sooner.