Free browser activity · updated November 2026

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.

Download SkillArena: Focus Training on the App StorePlay free on iPhone · no account, no ads

Go / no-go, 24 trials

Tap on blue. Hold still on red.
0hits
0false alarms (tapped on red)
0misses
—avg reaction, ms
GO
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

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

SkillArena home: Today's Arena, four games in about four minutes, level 4 Strategist, today's quests and the Focus Academy
Today's Arena: four games, about four minutes.
SkillArena Choose Your Battle: Today's Arena, Daily Duel, The Tower, Deep Focus 30-trial go/no-go, Pressure Round and Boss Gates
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.

Download SkillArena: Focus Training on the App StoreDaily Arena · about four minutes

Sources

  1. NIOSH, Work hour training for nurses, module 2: afternoon dip in the circadian rhythms that promote wakefulness while sleep pressure builds.
  2. 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).
  3. 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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