Perceptle Track practice.
The ball disappears. The motion carries on in your head. Learn to judge where the arc meets the ground.
Ready when you are.
Watch the ball until it disappears. Tap the ground where you think it will land.
Independent practice round · Randomized each time · Best score saved locally
Look a little further down the arc.
- Press Start and follow the ball as it travels along a curved trajectory.
- The ball disappears partway through its flight. Tap the field at the horizontal position where you expect it to land.
- Compare your prediction with the revealed full path and actual landing. The green mark is the true landing; the ring is your prediction.
A useful way to improve
Watch horizontal speed and vertical motion together. A ball still climbing has more flight left than a ball already descending. Use the visible portion of the arc to imagine its continuation rather than extending a straight line.
What the score means
Your horizontal distance error is measured on a logical 800-unit field, with a tolerance of 60 units. The same landing is used when the display resizes, so a smaller screen does not change the scoring scale.
Every score is out of 100. A fresh target appears each round, and your best for this exercise stays in your browser. Read the score curve and grade thresholds for worked examples.
Touch and keyboard controls
Tap or click the field after the ball disappears. For keyboard play, use the landing-position slider and then Lock landing position. Slider values run from 0 at the left edge to 800 at the right.
If you switch apps or hide the page during an active round, it stops without recording a score. Resize the window freely: targets are drawn in the same logical field and saved results remain intact.
Teaching examples · not today’s puzzle or an official answer
Track example: height alone does not tell you where it lands.
A ball can pass the same height twice: once going up, once coming down. Its remaining flight is different at those two moments. First read the direction of motion, then carry its horizontal speed forward to the ground.
1. Still rising: more time remains
In a two-second example flight, the ball starts at horizontal position 90 and lands at 650. At 0.5 seconds it is at position 230 and still rising. It has 1.5 seconds and 420 horizontal units left.
2. Already falling: less time remains
At 1.5 seconds it passes the same height at position 510, now falling. Only 0.5 seconds and 140 horizontal units remain. Extending either point in a straight line misses the curved continuation.
Use equal time to judge horizontal speed
In this example the horizontal speed stays at 280 units per second: the ball moves 140 horizontal units in each half-second. Two observations at positions 90 and 230, half a second apart, imply the same horizontal step as 230 to 370 over the next half-second. The direction and remaining time determine how many such steps are left.
Read one result
Actual landing: 650. Prediction: 590. Your mark was 60 units short, so the normal 60-unit tolerance gives 61 / 100. The revealed curve lets you ask whether you underestimated the remaining flight or the horizontal speed.
Change one thing next round
Before the ball disappears, consciously label its vertical motion “rising,” “near the top,” or “falling.” Then carry the observed horizontal motion through the remaining arc. After the result, compare the ring with the green landing. If you repeatedly stop short, inspect which of those two judgments was too small; do not add a fixed distance to every new flight.
Try Track and label the flight phase ↑Diagnose repeated Track errors →See why Friday’s ricochets need a different path →Another way to trust your instincts.
Try Angle