# HelloEnjoy

- **Event:** [Built with Opus 4.7: a Claude Code hackathon](https://cerebralvalley.ai/e/built-with-4-7-hackathon)
- **When:** Apr 21 at 12:00 PM – Apr 27 at 2:00 AM (EDT)
- **Where:** Online
- **Team:** [Carlos Ulloa](https://cerebralvalley.ai/u/c4rl05)
- **GitHub:** https://github.com/C4RL05/hellorun2
- **Demo video:** https://youtu.be/VsN1JdoB2uQ
- **Gallery:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/183

HelloRun 2 lets you turn any track you own into a playable first-person rhythm level. Drop an audio file in and the game analyzes it in-browser — BPM, beat grid, section structure, no upload — then derives the entire corridor from that analysis. Gates land on beats, turns on bars, and verse/chorus/bridge each paint the world and tune the difficulty.
It's a prototype for the sequel to our 2013 Chrome Experiment HelloRun, rebuilt from scratch with Claude Code on Opus 4.7. Fully open source.
Play now: https://hellorun2.pages.dev/

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Markdown version of https://cerebralvalley.ai/e/built-with-4-7-hackathon/hackathon/gallery/183. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt