Stroop Test
Tap the COLOR of the word, not the word itself. 30 seconds.
More games
See all β
About the Stroop test
The Stroop effect, first described by John Ridley Stroop in 1935, is one of the most reliably reproduced phenomena in cognitive psychology. The task is deceptively simple: a word naming a colour appears on screen, but the colour the word is printed in is different from the word itself. You must respond to the colour of the ink, not to the word β and the brain is much slower at this than it is at simply reading.
Kioku Games packages this classic into a 30-second arcade run. Each correct answer is worth 100 points, and a wrong answer costs 50. The mismatch rate ramps up as the clock ticks down: at the start of the run roughly half of the trials match (easier), but by the final seconds nearly every trial is mismatched (harder). Score over 200 points and you are doing well.
Why it is hard
Reading is automatic. By the time most adults reach their teens, decoding letters into a word happens faster than the conscious brain can intercept. So when you are shown the word "BLUE" written in red ink and asked to say "red", the reading pathway fires first and tries to make you say "blue". The Stroop test measures how quickly your prefrontal cortex can override this impulse β which is exactly the kind of attentional control that gets fatigued by lack of sleep, alcohol, or chronic stress.
A consistent improvement on Stroop scores is one of the few cognitive metrics that correlates with measured improvements in real-world impulse control. So while it might feel silly tapping coloured buttons under time pressure, the underlying skill transfers β at least a little.