The Bet
Party games have a shelf life. Once you've seen all the prompts in Cards Against Humanity or played Quiplash enough times, the novelty fades. Our hypothesis: AI-generated content solves the "played it once" problem by making every session genuinely unique.
Not just randomized — contextually generated. An AI narrator that riffs on player answers, creates callbacks to earlier rounds, and adapts difficulty based on the room's energy.
What We Built
A browser-based multiplayer party game platform where players join from their phones. The core stack:
- Next.js frontend with real-time WebSocket connections
- Claude API generating prompts, judging answers, and narrating rounds
- ElevenLabs for text-to-speech narration (the AI "host")
- Phone controllers — no app install, just scan a QR code
The minimum viable game: AI Quiplash. Players get AI-generated prompts tailored to the group, submit answers, and an AI narrator judges and comments on them with callbacks to previous rounds.
We time-boxed the build to two weeks.
What Happened
Eight playtest sessions with different groups. Key findings:
- 100% replay rate — every single tester wanted to play again immediately
- AI narrator was the breakout feature — players quoted it back to each other days later
- Average session length: 34 minutes — well above our 15-minute target
- NPS score: 72 — strong for an early prototype
The surprise: players didn't care about the AI-generated prompts as much as we expected. What hooked them was the AI commentary — the narrator's ability to reference earlier answers, create running jokes, and roast players contextually.
What We Learned
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AI as performer > AI as content generator. The value isn't in generating more prompts. It's in creating a dynamic host personality that makes each session feel like a unique event.
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Latency is the enemy. Any pause longer than 3 seconds for AI generation broke the energy. We had to heavily optimize prompt chains and pre-generate where possible.
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Voice changes everything. Text-only narration scored much lower in testing. Adding ElevenLabs voice synthesis made the AI narrator feel like a real host.