Follow the signal. Try twenty-four go/no-go rounds.
Try 24 go/no-go signals in this page. Tap for blue signals and leave red signals alone. The activity reports counts and approximate response times from this run. Hiding the page interrupts the run.
Press Start. A square flashes 24 times. Tap the big button for blue, do nothing for red. About a second each.
Timing is measured in your browser and is approximate. This is a sketch of a go/no-go task, not a clinical test, and it stores nothing.
Follow one simple instruction across 24 signals: tap for blue and do nothing for red. This original browser activity records responses only while the page remains visible. It does not assess attention, fatigue, health or ability.
This browser activity reports only what happened during its 24 signals: blue signals tapped, red signals tapped, blue signals missed, and average response time for recorded blue taps. Those results do not establish why you responded that way, whether you are tired, or how you perform away from this page.
A result describes this run, on this device, under these conditions.
Honest limits, before the app
It is a game.SkillArena's listing says its ratings describe performance in its own games and are not an IQ score or a medical, psychological or clinical assessment. The test above is even less than that.
No training claim.We do not claim that four minutes a day makes you better at anything except the games. Research on brain-training transfer is thin; we have said so on another page and the position has not changed.
Game Center is optional and public.Leaderboards show your Game Center name. They are off unless you turn them on and need a connection.
New app, iPhone and iPad, iOS 18.Version 1.1 from September 2026. Few reviews yet.
Questions people ask the test
What is a go/no-go task?
A signal appears; the player responds to one kind of signal and withholds a response to another. This original 24-trial browser activity illustrates that general instruction. It is not a validated version of a laboratory assessment and does not reproduce the SkillArena app's scoring.
How should I read this result?
Read it as a description of this run. Browser scheduling, screen refresh, input method, practice and distractions affect the counts and timing. There are no clinical thresholds, tiredness labels or population comparisons. Hiding the page interrupts the run and discards its result.
What does SkillArena actually claim?
Per its listing: it is a game, ratings describe performance in SkillArena's own games, and they are not an IQ score or a medical, psychological or clinical assessment.
Is SkillArena free?
The current US listing shows a free download and no listed in-app purchases. Offers can change; check the App Store before downloading.
How long is a session?
The Daily Arena is four games in about four minutes; Quick is about two and Extended about eight, per the listing. This browser activity is separate.
What the four minutes look like
Today's Arena: four games, about four minutes.Deep Focus: the 30-trial go/no-go, which the test above is a sketch of.
A fictional example of reading the counts
One invented runSuppose a run contains 18 blue signals and 6 red signals. The player taps 17 blue signals, misses one blue signal and taps one red signal. The other five red signals correctly receive no tap.
What followsThere are 22 correct responses out of 24 trials, approximately 92%. A displayed average of 420 ms would describe only the 17 recorded blue taps. Neither number establishes tiredness, everyday focus, a diagnosis or a benefit from the activity.
Play free on iPhone
SkillArena: Focus Training. Four short games a day, thirteen in the arena, a 30-trial Deep Focus go/no-go, ratings explained in full. Free, no account, no ads, offline.
Robertson, I. H., Manly, T., Andrade, J., Baddeley, B. T., & Yiend, J. (1997). ‘Oops!’: Performance correlates of everyday attentional failures in traumatic brain injured and normal subjects. Neuropsychologia, 35(6), 747–758. doi:10.1016/S0028-3932(97)00015-8 (the Sustained Attention to Response Task, the lab form of go/no-go).
SkillArena: Focus Training on the App Store, listing and release notes read 4 November 2026 (version 1.1.0): Daily Arena lengths, Deep Focus, ratings statement, free and offline, Game Center.
General information. The in-page test is a demonstration and stores nothing; it is not an assessment of attention, health or ability.
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