Hue Cue — The Stroop Effect

Hue Cue scored 4.6, second-highest in Issue One. It is, mechanically, a browser implementation of the Stroop effect — one of the most-studied phenomena in cognitive psychology. The fact that you can get a 4.6 game from a 90-year-old psychology demonstration is itself worth examining; this article is about what makes the Stroop effect a good game, and what we did to make Hue Cue more than just a demonstration of it.

The Stroop effect in one sentence

If you read the word "RED" printed in blue ink, the time it takes you to identify the ink colour is meaningfully longer than the time it would take if the word were "BLUE" printed in blue ink. The 1935 paper by John Ridley Stroop established this delay as a robust feature of human cognition: the automatic process of reading the word interferes with the slower process of identifying the colour. Sixty years of follow-up research has confirmed it across cultures, languages, and presentation styles.

This is interesting psychology. It is also a game mechanic, because the delay produces a clear distinction between "automatic" and "controlled" responses, and a player who can override the automatic response is measurably faster than one who cannot.

What Hue Cue adds

A literal Stroop demonstration is not a game — it is a one-off curiosity. To make it a game, we had to add four things.

First, a continuous score. The original Stroop test produces a single delay number; a game needs a running total. We award points per correct response, scaled by speed, with a small penalty for errors. The result is a score that climbs over a 60-second round, with the best scores coming from players who are both fast and accurate — exactly the Stroop trade-off.

Second, escalating difficulty. Early in the round, the word-colour mismatches are simple: RED in blue, BLUE in red. As the round progresses, we introduce harder cases: words that name colours we are not using (so they are distractors that have to be ignored entirely), and presentations where the word changes faster than the colour. These extensions push the Stroop interference into more difficult territory and prevent players from finding a static rhythm.

Third, immediate feedback. The original test measured response time after the fact; Hue Cue shows you correct or incorrect within milliseconds. This converts the game from an experiment into a skill-building loop, where players can feel themselves getting faster across a session.

Fourth, and most importantly: a clear path to improvement. The trick to overriding the Stroop effect — to letting your colour-identification beat your reading — is to defocus the word, letting your peripheral vision read the colour while your central vision ignores the letters. We do not tell players this; we let them discover it. Most do, around minute three. When they do, scores jump abruptly.

The fairness question

The Stroop effect is stronger in some people than others, and culturally it varies — non-native English readers experience less Stroop interference than native readers because the word-reading process is slower for them. We accepted this; Hue Cue is not pretending to be a universal skill test. It is a culturally-situated cognitive game, and we noted this in the review. Players for whom the words are not automatically readable will find the game easier, which is the opposite of the usual game-design problem.

Why it scored 4.6 and not 4.7

The 0.1 gap between Hue Cue and Pulse Lock is small but real. Pulse Lock is a pure mechanic that becomes about prediction; Hue Cue is a pure mechanic that becomes about attention control. Both are excellent. Pulse Lock edges it because the skill it builds — predicting motion below conscious reaction — generalises more broadly. Attention control also generalises (it transfers to anything requiring focus), but the specific path of "ignore the meaning, see the colour" is narrower. Both are 4-plus games. Reasonable players will disagree about which is better, and we would not push back hard if someone preferred Hue Cue.

Published · 14 May 2026 · Written and signed by Bill