The truth is what survives the telling.
Hearsay is a browser-based social-memory game set in Greyhaven. You have three days to shape a mayoral election in a town where NPCs remember conversations, spread changing rumors, and vote from the experiences that reached them.
Play the replay demo · Watch the project video
Most game NPCs remember isolated conversations. Hearsay uses CockroachDB as the durable memory layer for an entire NPC society: each resident holds their own beliefs, every retelling keeps its lineage, and decisive memories can be traced to the election result they influenced.
The player acts, an NPC recalls holder-scoped memories through CockroachDB's vector index, Amazon Bedrock produces a bounded response or decision, and the validated consequence returns to CockroachDB in a serializable transaction. The Town Historian audits rumor lineage through Managed MCP.
- A walkable 2D town with twenty residents and a three-day campaign
- Private NPC memory, shared town memory, and versioned rumor transmission
- Semantic recall with immutable belief versions and decision provenance
- Persistent relationships, promises, schedules, weather, and election votes
- An explainable finale that cites the memories behind decisive votes
Next.js · React · FastAPI · CockroachDB Cloud · Distributed Vector Indexing · Managed MCP · Amazon Bedrock · Amazon S3 · BGE embeddings
Requires Node.js 22 and pnpm 11.9.0.
pnpm bootstrap
pnpm doctor
pnpm playOpen http://localhost:3000.
Hearsay source code is available under the MIT License. Third-party assets and models retain their respective licenses.