Any
$6/hour
30
Jul 5, 2026
Reaction Game (approx. 60 min, paid)
What to build
A reaction game as a single HTML file (HTML/CSS/JS, no frameworks):
Click "Start" ? after a random delay (1–5 sec.) a click target appears
User clicks as fast as possible ? reaction time is measured in ms
5 rounds, then show: all times, average, and best time
Save best result in localStorage (survives page reload)
Clicked too early? ? detect it and handle it in a sensible way
Requirements
Modern UI – well designed, no default browser look
Works on smartphones too (touch)
AI tools
Explicitly encouraged! Preferably Claude Code (CLI) – if you don't have it, Cursor, Copilot
& co. are just as fine.
Important: Screen recording
Record your screen during the entire task (e.g. with OBS). We want to see how you work:
your prompts, your testing, your fixes. Send it as MP4 or a link (Drive, YouTube unlisted).
Deliverables
1. The HTML file
2. The video
3. 3–5 sentences: Which tools did you use? How long did it actually take?