# Pettigrew Lab

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Joel Pettigrew](https://cerebralvalley.ai/u/PettigrewLab)
- **GitHub:** https://github.com/pettigrewlabllc/playtest-watcher
- **Demo video:** https://youtu.be/ouo4SOP2VuQ
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1217

Playtest Doubles builds AI playtesters from how real players actually play, then holds them to those limits while they play your game. I've built twenty-some games with AI in the last six months, and building isn't the long part anymore. Finding the fun is. My four kids are my playtesters, and a kid only gets one first time with a game. So a double plays first.

It watches a real playtest (screen, face, hands and voice, lined up with the game's event log) and measures how long a player looks before tapping, how fast they go, how much they read, how often they miss, and how many fails before they quit. You can also start from a GA4, GameAnalytics or Unity export, a survey, or one sentence. Every number says where it came from: measured, said so, or a published norm by age.

A double plays the real game in Chrome while a harness holds it to those limits. The game clock stops while the model thinks, text it wouldn't read gets hidden, some taps miss, and the harness decides when it quits. On two builds no kid had played yet, the doubles found two problems before a kid ever saw them. It runs locally as a CLI and an MCP server, open source under MIT.

## More from Meta Global AI Developer Hackathon

- [WorldLab](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1214)
- [Harold Cooper](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1215)
- [Lantern Keep](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1216)
- [Omnibasket](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1218)
- [LittleCreator](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1219)
- [ScoreSnap](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/1220)

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