How to take the test
Start a run, wait through the neutral state, and respond only when the game arena shows the green signal. Pointer, Space, and Enter all work, so you can use the input method that feels natural on your device. If you act early, the round is labeled too soon and ignored. Because it is not a valid result, that same round resets and the run continues.
The test cancels an active wait if the tab becomes hidden because browser timing can be paused or delayed in the background. Results are stored locally in your browser so a later attempt on the same device can be compared without an account.
Scoring method
Your main score is the median of five valid reaction times, measured withperformance.now(). Human Arena also displays the mean, fastest, slowest, and all five round values. Lower milliseconds are better for this test.
Why results vary
Display refresh rate, mouse or keyboard latency, touch hardware, power mode, and system load can move your score. Treat the result as an entertainment and general-information measurement, not as a medical, diagnostic, neurological, or IQ assessment.
What this game challenges
Reaction Time Test measures simple visual reaction speed: how quickly you notice a sudden visual change and begin a response. It is a single, narrow timing task, not a measure of thinking speed, intelligence, or overall fitness.
Mouse, keyboard and touchscreen differences
A mouse or keyboard usually gives the fastest, most consistent response because the signal travels a short wired path. Touchscreens add a small delay from finger contact and can vary with screen protector, glove, or stylus. Treat cross-device comparisons as approximate.
What this result does not mean
This is a game result, not an IQ score or diagnosis. Read the scoring methods and measurement limits.