Does angle affect the score?

No — only the Euclidean distance between your two points is measured. You can orient your pair at any angle.

What percentage error is top-tier?

Under 5% is excellent. Under 10% is solid. Average untrained players land around 12–18% error.

Is this related to length estimation research?

Yes — this task is studied in psychophysics as "distance reproduction." Humans are reasonably accurate for distances in the 10–40% of visual field range but less accurate for very small or very large gaps.

Can You Match the Distance?

Can you match a distance — copy the exact gap between two dots somewhere else on screen? A reference pair of dots appears with a fixed separation. You then click to place a second pair at the same distance, possibly at a different angle. Your score is the percentage error between your reproduced distance and the reference. It sounds simple until the reference disappears and you realize your distance memory is fuzzier than expected.

How to Play

A reference distance is shown as two connected dots.
Click to place your first dot, then click again to place the second.
Your pair's distance is compared to the reference.
Score is the percentage difference from the original gap.

Why It's Hard

Distance estimation is highly context-dependent. The same gap looks larger when surrounded by smaller objects and smaller when surrounded by larger ones — a spatial version of the Ebbinghaus illusion. When you reproduce the distance at a different location with different surroundings, your estimate is influenced by the local context, not the stored absolute value.

Tips

1Before the reference disappears, note any nearby canvas features at the same distance — use them as anchors.
2Recreate the distance at a similar angle to the original — angular change introduces additional estimation error.
3If the reference seems about 1/4 of the canvas width, use the canvas edges to calibrate your reproduction.

FAQ

Does angle affect the score?: No — only the Euclidean distance between your two points is measured. You can orient your pair at any angle.
What percentage error is top-tier?: Under 5% is excellent. Under 10% is solid. Average untrained players land around 12–18% error.
Is this related to length estimation research?: Yes — this task is studied in psychophysics as "distance reproduction." Humans are reasonably accurate for distances in the 10–40% of visual field range but less accurate for very small or very large gaps.

Built by

Ethan R. Caldwell

Game Developer · Wilmington, DE

Designed Can You Match the Distance? and 46 other browser puzzles. Game developer based in Wilmington, Delaware. Hardcore puzzle gamer at heart — obsessed with logic puzzles, sokoban-style mechanics, and physics-based brain teasers. Off the clock, unwinds with ARPGs, RPGs and JRPGs.

[email protected]