Reaction Challenge — Catch the Moment It Turns Green

Info

Reaction Challenge measures how fast you can tap the moment the screen turns green. Five rounds, averaged into one of six grades, with a TOP 10 record board. Up to four people can share one phone and race each other. Works offline, no sign-up.

When the Screen Turns Green, Tap

You watch a red screen and wait. The moment it changes is different every time. Tap as it turns green and the milliseconds in between become your time. Five rounds are averaged into your score.

Tapping early does not count. If your hand goes before the green, you get Too fast! and that round starts over. The longer the wait runs, the harder it is to hold still, and the game shows you exactly that habit.

• ⚡ Five-round average — one lucky tap will not carry you
• 🏆 Six grades — Pro Gamer, Cheetah, Eagle Eye, Cat, Ordinary Human, Relaxed Sloth
• 👥 Up to four players at once — share one phone; the top zones rotate 180° so people can sit face to face
• ⏱️ Early tap costs +100ms — in multiplayer it is a penalty rather than a disqualification
• 🏅 TOP 10 records — a new best shows you where it landed
• 📣 Share your average — send the result straight to a friend

It works fully offline with no sign-up or login.

Gameplay Video

Download

• Google Play: https://play.google.com/store/apps/details?id=com.fadongkwon.reaction↗ (opens in a new tab)
• Apps in Toss: https://fadongkwon.com/toss/reaction/↗ (opens in a new tab) — open it on your phone and it connects straight into the Toss app.

Released Alongside

Memory Cards went out the same day. These two were where I first tried building in web technology and publishing to Google Play and Apps in Toss at the same time.

After these, mini games started shipping in batches. That story is in Shipping Six Mini Games at Once.

I post updates here and on Instagram (@fadongkwon.soft)↗ (opens in a new tab).