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Color Match shows a colour word printed in a different colour and asks for the ink, not the word. It is the Stroop task, and the interference is real: reading is automatic in literate adults, so the word fires before you can stop it. Twenty rounds is enough to see your own error pattern clearly.
A colour word appears, printed in a colour that usually does not match it.
Choose the colour of the ink, ignoring what the word says.
Answer quickly — both speed and accuracy are scored.
Wrong answers are logged so you can see where the interference bites.
Twenty rounds, then a summary of your hits and misses.
Cognitive inhibition — suppressing an automatic response in favour of a deliberate one. This is the single most studied measure of executive control, and it is the ability that everyday 'focus' mostly consists of.
Blur your eyes slightly so the word is less legible. Degrading the text weakens the automatic reading.
Look at one letter rather than the whole word. A single letter carries the colour without triggering the word.
Say the colour out loud. Speaking commits you to the answer before the word can override it.
Slow down by a fraction. Almost all errors here come from answering faster than your inhibition can act.
Reading is automatic and colour naming is not, so the word reaches your response system first. The conflict you feel is that race.
It is the same phenomenon. Our Stroop Test page runs the timed clinical-style version; Color Match is the shorter twenty-round format.
It shrinks but never vanishes. That persistence is exactly why the effect has been used as a measure for close to a century.
If you have difficulty distinguishing the colours used, the score measures vision rather than inhibition. Go/No-Go is a better inhibition test in that case.