Game Guide
How the five round Reaction Speed demo works, what the elite, fast, good and slow grades actually mean in milliseconds, and how to stop firing early.
Reaction Speed is the least strategic game in MyRin and one of the most humbling. There is one control, one thing to wait for and no board to read. Everything that separates a 190 millisecond round from a 310 millisecond round happens in the two seconds before the target appears, which is why watching somebody else play it is genuinely useful: the interesting part is the waiting, not the tap.
Here is the MyRin short for Reaction Speed. This one reads especially well on video, because you can see the early taps and the recovery in real time.
The free browser version runs five rounds. Each round arms itself, waits a random interval, then turns the target green. The moment it turns green a timer starts. The moment you tap, it stops. The number you see is that gap in milliseconds, and nothing else feeds into it.
The random wait is the important design decision. It sits between roughly 1.2 and 3.8 seconds, and it is redrawn every round. A fixed delay would be easy to game: you would learn the interval after two rounds and start your tap slightly before the target appeared, which would produce lovely numbers that measured your sense of rhythm instead of your reaction. The random window makes anticipation strictly worse than reacting.
The game does not grade you vaguely. The thresholds are fixed and worth knowing before you start, because they tell you what to aim at:
| Result | Grade | What it means |
|---|---|---|
| Under 180 ms | Elite | At or near the physiological floor for a visual stimulus. Rare and not sustainable across every round. |
| 180 to 239 ms | Fast | A genuinely quick, well prepared response. This is the realistic target for most people on a good round. |
| 240 to 319 ms | Good | Normal adult range on a screen with a normal amount of attention. |
| 320 ms and above | Keep practising | Usually attention, posture or input lag rather than reflex. |
Your best time across sessions is stored locally in the browser, so the personal best you see on round one is the one you set last time. That single number is the whole progression system, and it is the reason the five round demo has more replay value than its length suggests.
Round one is a throwaway and you should treat it as one. You do not yet know how long the wait feels on this device, and almost everybody either fires early or arrives late on their first attempt. Read it as calibration, not as a score.
Round two is where the early tap usually happens. Having now experienced one wait, your brain forms an expectation of the interval, and the random window promptly violates it. An early tap flags the round and resets it. There is no lasting penalty, but each one costs you a clean measurement.
Rounds three and four are your real attempts. By this point the wait no longer surprises you and you have stopped predicting it. These are the rounds most likely to land in the fast band if anything is going to.
Round five is where fatigue shows. Sustained readiness is tiring in a way that is easy to underestimate, and a fifth round that is forty milliseconds slower than your third is the normal shape of the curve, not a failure.
The first is hovering. Most people hold a finger or cursor just off the target and tense the hand while waiting. Sustained muscle tension does not shorten your response; it adds a small amount of noise and it tires you across rounds. Rest the finger lightly in contact with the surface, or park the cursor on the target and relax the hand entirely.
The second is predicting. If you catch yourself counting, or feeling that the target is due, you have switched from reacting to timing, and timing against a random interval is a losing strategy. The fix is counterintuitive: stop watching the target closely and let your gaze sit softly on it. Detection of a large, high contrast change does not require focal attention, and trying hard to see it adds a decision step that costs you time.
There is also a boring mechanical factor worth ruling out. Display refresh rate and input latency genuinely affect this measurement. A 60 Hz screen adds up to about 16 milliseconds of uncertainty before the target is even drawn. If you want your number to be comparable between sessions, use the same device and the same input method every time.
Simple reaction time is close to a fixed personal trait. It is shaped by nerve conduction speed, age and arousal, and no amount of tapping practice moves it far. What practice does move is everything around it: how consistently you arrive in a ready state, how well you resist anticipating, and how little tension you carry while waiting. Those are attentional skills, and improving them typically pulls a slow average down toward your actual floor rather than lowering the floor itself.
That is a real improvement and worth having. It just means the right way to read your progress is not the single best round, which is largely luck, but the spread across five rounds. A player whose rounds land at 210, 225, 215, 230 and 240 is in better control than one who posts 185 and then 340, even though the second has the prettier best time.
The installed game extends this into 600 rounds for the title with the same measurement, which makes the average across a long session meaningful in a way that five rounds cannot be. The demo is enough to find your range and to expose whichever of the two bad habits you have.