反応速度テスト｜0.000秒ストップウォッチ

ReactionStopwatch is a simple reaction and focus game where you try to stop the countdown as close to 0.000 seconds as possible.

Choose from 10-second, 5-second, and 3-second modes, then press START. When the countdown reaches 0.000, press STOP and see how close you were.

Features:
- Visible Mode: Watch the countdown and stop at the perfect moment
- Blind Mode: Hide the timer and rely on your sense of timing
- 10-second, 5-second, and 3-second game modes
- Score based on how close you are to 0.000 seconds
- Too Early result for early stops
- Best score saved locally
- Simple one-screen design
- Large text and large buttons for easy play
- Works completely offline

Try again, improve your timing, and aim for a perfect 100-point score.