Flash Tap — Grid Reaction Speed Game
Hit the green tile before it fades from the grid
What this level trains
Flash Tap is a pure reaction game: one tile lights up green somewhere on the grid, and you tap it before it goes out. Every set is exactly ten tasks, each preceded by a random wait, so you cannot count beats to predict when the target will appear.
Scoring counts only the tasks you hit. Each hit records a reaction time, and at the end the fastest and slowest are dropped once before the rest are averaged, so a lucky quick hit or a single distracted slow one does not skew the set. Fails are tracked separately and folded into your accuracy.
The eight levels grow the grid from 3×3 to 8×8. The first four levels have a single green target with no time limit; from level 5 they add decoy colours and a shrinking deadline, so the grid caps at 8×8 while decoys and shorter holds keep raising the bar. Fourteen decoys crowd the grid by level 8.
A browser-measured reaction time includes display refresh rate, mouse or touchpad latency and system scheduling, so it is not a laboratory measurement. It is best used to compare yourself on the same device over time rather than to compare raw numbers across different devices.
How to play
- Watch the grid, not the pointerKeep your gaze spread across the whole grid instead of following the cursor around. The green target lights up after a random delay, anywhere on the board.
- Tap the moment it lightsAs soon as a green tile appears, hit it. The press itself is what counts, so you do not need to wait for the button to come back up before moving on.
- Avoid wrong and impossibly fast tapsTapping a decoy or a normal tile fails the task, and a press faster than the human floor is treated as untrustworthy and also fails, which rules out spam-clicking for a lucky hit.
- Read the summaryAfter ten tasks you get hits, fails, a trimmed-mean reaction time and a grade. Fewer than three valid samples scores zero for the set.
8 difficulty levels and score thresholds
All eight levels grade on the trimmed-mean reaction time, where lower is better. The first four levels grow the grid from 3×3 to 6×6 with no time limit; from level 5 the target gains a deadline and decoys, at 1.6 seconds and 3 decoys, then 1.5 and 5, then 1.35 and 9, and finally 1.2 seconds with 14 decoys. The pass line rises from 680 milliseconds at level 1 to 1,120 milliseconds at level 8.
| Level | Grid | Full-mark line | Excellent | Good | Pass | Max score | Notes |
|---|---|---|---|---|---|---|---|
| Level 1 | 3 × 3 (9 cells) | 336 ms | 480 ms | 560 ms | 680 ms | 3000 | 10 tasks · No time limit |
| Level 2 | 4 × 4 (16 cells) | 364 ms | 520 ms | 610 ms | 740 ms | 4000 | 10 tasks · No time limit |
| Level 3 | 5 × 5 (25 cells) | 392 ms | 560 ms | 660 ms | 800 ms | 5000 | 10 tasks · No time limit |
| Level 4 | 6 × 6 (36 cells) | 420 ms | 600 ms | 710 ms | 860 ms | 6000 | 10 tasks · No time limit |
| Level 5 | 7 × 7 (49 cells) | 441 ms | 630 ms | 740 ms | 890 ms | 7000 | 10 tasks · 1.6s time limit · 3 distractor blocks |
| Level 6 | 8 × 8 (64 cells) | 476 ms | 680 ms | 800 ms | 960 ms | 8000 | 10 tasks · 1.5s time limit · 5 distractor blocks |
| Level 7 | 8 × 8 (64 cells) | 525 ms | 750 ms | 880 ms | 1.1 s | 9000 | 10 tasks · 1.35s time limit · 9 distractor blocks |
| Level 8 | 8 × 8 (64 cells) | 560 ms | 800 ms | 940 ms | 1.1 s | 10000 | 10 tasks · 1.2s time limit · 14 distractor blocks |
You can only reach the maximum score at or under the full-mark line. Past the pass line the score keeps decaying, down to 0 at twice the pass line. The maximum rises from 3000 to 10000 across the levels.
Tips and common mistakes
- Use your whole handKeep fingers near the trigger and drive from the wrist. Shaving a few milliseconds off travel matters in a test decided by hundreds of milliseconds.
- Centre your gazeThe target can appear in any cell. Holding your eyes near the grid centre and scanning with peripheral vision is faster and steadier than chasing the pointer.
- Filter by hue firstThe upper levels are full of decoys, but the target green is distinct in hue and brightness from the blue, indigo and amber decoys, so screen for green first, then confirm the cell.
- Err early on timed levelsA 1.2-second window sounds generous, but in an 8×8 grid full of decoys hesitation is enough to miss it. A slightly early tap beats one that lands too late.
Frequently asked questions
- Why is my score affected by my device?
- A browser reaction time spans from the stimulus being painted to your press, including display refresh, input-device latency and system scheduling. A higher-refresh monitor or a different input device changes the reading, so Flash Tap is best compared against your own history on one device.
- How long does one set take?
- A set is ten tasks, each waiting 0.4 to 2.5 seconds before the target lights up, plus a short feedback gap between them. An easy level finishes in about half a minute, while the timed levels feel much more tiring because you stay braced throughout.
- What happens if I tap the wrong cell?
- Tapping a non-target tile fails that task and moves straight on, so you do not burn attempts on a wrong area. The failure lowers your accuracy, and since accuracy is a multiplier it directly reduces your score for the set.
- Can I trust the number?
- Simple visual reaction time for humans is usually 200 to 300 milliseconds, yet readings around 400 milliseconds are common in a browser. Much of the extra comes from the device and the measurement chain rather than from you, so treat it as a same-device trend, not an absolute result.
- Does it work on a phone?
- Yes. Both touch and mouse input are supported and the grid scales to the screen width. Note that touch latency usually differs from mouse latency, so results from the two devices should not be compared directly.
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Content updated on 2026-10-03 · Level 7 · Reaction