A live swatch drifts lighter and darker on its own. Hold it in the target zone with the ▲ / ▼ (up/down) controls. 3 rounds, getting faster.

What Huedrift trains

Huedrift works continuous lightness tracking: holding a color on a target while it keeps sliding away from you. Most color games ask for a verdict and then stop. This one never stops: the swatch drifts lighter and darker on its own, and your job is to keep it inside a narrow band for as long as the round lasts. That turns a judgement into a control loop. You are not deciding once whether the color is right; you are reading the error, applying a correction, and reading the result of your own correction, several times a second.

How to play

Press Start, wait out the countdown, three seconds before the first round and two before the others, and the swatch begins to drift. Hold ▲ to lighten and ▼ to darken; on a keyboard, hold Arrow Up or Arrow Down. Only one direction is active at a time, and the correction runs while the key or button is held rather than nudging in steps. A marker on the rail shows where you are relative to the target zone: inside the band it sits calm, outside it grows a halo that shifts from yellow towards red the further out you drift. The daily Lock mode runs three rounds of fifteen seconds, each drifting faster than the last. A separate Survival mode runs one continuous attempt: the speed ramps up with time, a health bar drains whenever you are outside the band, and the run ends when it hits zero.

How scoring works

In Lock mode each round scores the percentage of time you spent inside the target zone, and your Lock-score is the average of the three rounds. The band is about six lightness units either side of the target, which is narrow but not hairline. A live meter shows the running figure during the round, and the result card breaks the total down round by round alongside a twelve-slice trace of where you held and where you lost it. A Lock-score of 60 or better earns the day's streak. Survival is scored in seconds survived; it keeps a streak of its own, separate from the Lock-score streak, and lasting thirty seconds is what counts as a win for it.

What your score means

Read the Lock-score as a band, and look at the trace as well as the number:

Outcome	Rough interpretation
Lock 60 or above	Steady hand; you are correcting early, before the drift builds, and 60 is the score that earns the day
Below 60, but a strong round one	You hold it while the drift is slow; the faster rounds are outrunning your corrections
Below 60 across all three rounds	Usually oscillation, not blindness: you are chasing rather than damping

A falling score across the three rounds is expected: they get faster on purpose. A trace that is green early and red late means stamina, not sensitivity.

Common mistakes

The dominant error is over-holding. The correction is fast, so a long press sends you straight through the zone and out the other side; you correct back, overshoot again, and spend the round oscillating around a target you keep crossing. Short, early corrections beat long ones. The second mistake is waiting until you are visibly out: by the time the halo appears you have already lost time. Third, fighting the slow component: part of the drift is a steady pull in one direction, so repeatedly correcting the same way is the curve, not a mistake. Finally there is losing the hold, since switching tabs or letting the pointer slide off the button releases it and the drift takes over.

Practice progression

(5 min, beginner) Aim only to never leave the band in round one, even if rounds two and three fall apart; learning the correction rate is worth more than a score. (10 min, intermediate) Use the practice tab with a longer round to build stamina, then try Survival, where the ramping speed exposes whether your corrections stay economical when the drift gets quick. (weekly) Alternate with Huefork, which measures how small a lightness difference you can see at all, and read Hue, Saturation & Lightness.

The science behind it

This is a compensatory tracking task, the same family of task used to study hand–eye control. What makes it hard is delay: your eye takes time to register the error, your hand takes time to act, and by the time the correction lands the target has moved again. Corrections too large for that delay produce oscillation, which is why the fix for a low score is usually smaller inputs rather than faster ones. The drift is not random noise. It is a sum of three slow sine components plus a steady linear pull, so it is smooth and partly predictable, and skilled trackers stop reacting to where the color is and start anticipating where it is going. The visual side rests on lightness discrimination against a reference, the same sensitivity Delta-E quantifies.

Limitations

Huedrift is a game and an informal self-check, not a clinical or diagnostic tool. Browser timing, frame rate and input latency vary between devices, and a touchscreen, a trackpad and a keyboard do not behave alike, so scores are not comparable across hardware or against other players. It measures one narrow thing, holding lightness on a target, and says nothing about hue judgement, color memory, or motor control in general. A single day's Lock-score is noisy; the trend is the signal.

Where it shows up

Holding a value steady against something that keeps moving is ordinary work in a surprising number of places. A press operator watches tone shift through a long run as ink density and paper moisture change, and feeds in small corrections rather than waiting for a sheet to go visibly wrong. A colorist tracking a shot where the light changes mid-take rides the grade so the result reads as constant. A camera operator shooting under mixed light nudges white balance as a subject moves between a window and a lamp. Outside color, the shape is the same whenever a system drifts and a person is the feedback loop: a sound engineer riding a fader through a live vocal, a driver holding a lane in crosswind, a pilot holding altitude in unsteady air. In every case the winning strategy is not a big correction after the error is obvious but a small one before it grows, and the failure mode is always the same: over-correcting, crossing the target, and chasing yourself back and forth. Fifteen seconds of Huedrift makes that habit visible fast, because the trace shows exactly where you started chasing.

Can you hold it steady? Three rounds of fifteen seconds, each drift faster than the last, or switch to Survival and see how long you last.

Play today's Huedrift ↑

Frequently asked questions

How long is the daily game?

Three rounds of fifteen seconds in Lock mode, with a short countdown before each, so roughly a minute in total. Survival mode has no fixed length; it runs until your health bar empties.

What exactly is the Lock-score?

The share of the round you spent inside the target zone, averaged over the three rounds. A live meter shows the running figure while you play.

What is the halo around the marker?

A distance cue. It appears only when you are outside the band and shifts from yellow towards red the further out you drift. No number is shown during play.

How is Survival different?

One continuous run instead of three timed rounds. The drift speed ramps up as time passes and health drains whenever you are outside the band, so the score is seconds survived. It runs its own streak, kept apart from the Lock-score one, with thirty seconds as the win mark.

Does everyone get the same drift?

Yes. The day's drift curve is generated from the day's seed, so every player faces the same movement.

Huedrift

About Huedrift — hold a moving color steady