Perceptle Track practice
Track shows a ball on a curve for about two seconds, then hides it. You click the ground line. The field is 800 units wide and the ground sits at y = 450. Normal puzzles are generated so the landing falls between x = 450 and x = 760. Friday uses weaker gravity, at least one wall bounce, a longer 2,600 ms look, and a landing between 80 and 720.
On #97 I clicked x = 491.81 and the HUD read “0 px from the landing spot.” That point is 61.48% of the 800-wide field, and about 62.4% of the visible ground from 30 to 770. The miss I usually make is clicking the last place I saw the ball, which is still in the air. Ten units off scores about 99, thirty about 88, and sixty — one σ — about 61.
Trainer
The arc here is a schematic with a known landing. It is not a recording of a daily puzzle’s flight.


- Watch the whole curve, then look at the ground, not the vanishing point.
- Normal landings in the generator sit on the right half. Do not treat that as a promise for every replay.
- Friday: expect a bounce. The first downward line is not the landing.
- σ is 60 units normally and 90 on Friday. The grade cuts do not change.
Does Track score vertical error?
The public formula uses horizontal distance from the landing on the ground line. Click the line, not a point in the air.
Why did the ball vanish early?
That is the test. Normal hide time is 2,000 ms. You are supposed to predict, not watch the impact.