Reaction Time Free online game

What is it?

Reaction Time measures how fast you tap the moment the red screen turns green. A typical visual reaction takes roughly 0.2–0.3 seconds, so it's fun to see how your time compares.

Phones and PCs differ in how fast the screen updates and how long a touch or click takes to register, so the same person gets slightly different times on each. That's why Hanpanmadang ranks phones and PCs separately.

How to play

1. Wait while the screen is red
2. Tap as fast as you can when it turns green!
3. Tap early and the round restarts. 5 rounds in total

Playing on PC (keyboard · mouse)

On phones you tap the screen; on PC you can also use the mouse and the keys below.

Difficulty and rankings

There's a weekly ranking and an all-time ranking; the weekly one resets every Monday at midnight (Korea time). For details, see the Help.

Good to know on Hanpanmadang

• Your record is the average of five tries. The grade on the results screen is Lightning under 200 ms, Very fast under 250 ms, Fast under 300 ms, Normal under 360 ms, and Relaxed above that.
• Tapping before it turns green is a false start and that round is redone. The number of false starts is shown in your results too.

Common mistakes

Anticipating the timing and tapping early.

The delay changes every time. Guessing just adds false starts. Tap when you see the color change.

Rushing the next round after one slow try.

Your record is an average, so one slow round can be made up. Wait in the same position every time.

Tips

• Take a breath between rounds. Rushing from one to the next tenses your finger and actually slows you down.
• Hover your finger just above the screen. Any time spent lifting it adds to your time.
• In strong sunlight the color change can be hard to see. Try in the shade with the screen bright.
• Your times get noticeably slower when you're tired. Go for a record when you're feeling sharp.