Train reaction speed, response selection, and inhibitory control (no-go). Compare results and track your trend.
Level 1 is a simple “see green → click” baseline. Level 2 adds two skills that matter in real life: response selection (choosing the correct key) and inhibitory control (sometimes the best action is no action). In practice, this is a lightweight go/no-go reaction time challenge — fast reactions and clean decision-making.
If you want the deeper “what happens in the brain” explanation, read how reaction time works. To compare your score with typical ranges, use average reaction time by age and your own history in Your results.
For honest progress tracking: start with Reaction Test (Level 1) to get a baseline, then use Level 2 to train accuracy under pressure. Want a fun comparison story (average person vs gamer vs F1 driver)? See reaction time comparison.
Standard uses two color cues and two responses. Sound mode adds an audio cue. Advanced uses two colors + a sound cue mapped to different keys. Orange is always “no-go” — don’t press anything. That’s the point: fast is good, but false moves cost you.
Level 2 is not about “one perfect millisecond”. The meaningful signal is your repeatable average combined with accuracy. If you want your numbers to mean something, test on the same device and track trends over time.
Orange is a deliberate stop cue. If you press, it’s not “slow reaction” — it’s a control slip. Slow down slightly, relax your hands, and treat orange as a hard stop.
Device latency matters (screen refresh + input delay). For fair tracking, stick to one setup for a week or two and compare your averages — not single clicks.
Accuracy first. Once you stop making avoidable errors (especially on orange), your speed becomes much easier to interpret and improve.
Start with Reaction Test (Level 1), then build control with Flanker Task and Stop-Signal Test. If you want a decision-conflict challenge, try the Stroop Test.