REACTION
TIME TEST
React to the signal and progress through 12 levels with 3 to 10 rounds. A free browser reaction game with locally saved progress and no signup.
YOUR BEST
—
ATTEMPTS
0
TYPICAL RUN
35s
IN DAILY
NO
Browser, display, operating-system and input latency affect every result. Treat this as a game, not a clinical measurement or a claim about cognitive ability.
Accessibility: This mechanic depends on a visual signal. The instructions and results remain accessible, but assistive-technology latency cannot produce an equivalent timing test.
Wait for the signal. React as fast as you can.
The interactive challenge is loading.
LOADING
HOW TO PLAY
- Start the current level, with 3 to 10 rounds. Each round waits for a seeded random delay between 1.5 and 4.5 seconds.
- Press the stage, Space or Enter as soon as the WAIT state becomes GO. Pressing before the signal marks the round “Too soon” and restarts it without recording a zero.
- After all valid rounds, the result shows every measurement, the arithmetic average and your best single reaction.
WHAT YOUR SCORE MEANS
Your primary result is the average across the current level because it is less sensitive to one lucky input than a single reaction. A lower average is better.
Values below the game’s plausible browser floor are marked invalid rather than used in personal records. Slow but valid rounds remain visible so the average is easy to understand.
GAME SCORES · SAVED IN THIS BROWSER
Explore the 12-level Reaction Time course
Finish each level, then continue to the next. These goals are optional precision challenges; your score never blocks progress. After level 12, keep playing fresh bonus rounds at the final difficulty. Your place and level bests are saved in this browser.
- First steps. Finish 3 valid rounds with an average of 600 ms or less.
- Find your rhythm. Finish 3 valid rounds with an average of 500 ms or less.
- A little further. Finish 5 valid rounds with an average of 500 ms or less.
- Steady hands. Finish 5 valid rounds with an average of 450 ms or less.
- Keep it close. Finish 7 valid rounds with an average of 450 ms or less.
- New territory. Finish 7 valid rounds with an average of 400 ms or less.
- Stay focused. Finish 5 valid rounds with an average of 350 ms or less.
- Trust your eye. Finish 7 valid rounds with an average of 350 ms or less.
- The long way. Finish 10 valid rounds with an average of 350 ms or less.
- Fine margins. Finish 5 valid rounds with an average of 300 ms or less.
- Almost there. Finish 7 valid rounds with an average of 300 ms or less.
- Final challenge. Finish 10 valid rounds with an average of 300 ms or less.
QUESTIONS
Why can my phone and computer give different results?
Refresh rate, touch processing, mouse hardware and browser scheduling all add different amounts of delay. Compare trends on the same setup when possible.
Why use several rounds?
Several quick samples make the result less dependent on a single guess while keeping a full session short enough to replay.
Today’s challenge is waiting.
Resets at 00:00 UTC