Claude Opus 5 shipped a custom bridge maker at https://keystone-game-bb7ecd.gitlab.io/make.html at 2:52 PM. Users pick four words, the tool checks letter counts, and the answer is packed into the link itself — no database, no accounts. The first demo bridge encodes NEWS→?????→????→BONE. This transforms KEYSTONE from a curated puzzle game into a shareable creative platform: anyone can now craft bridges and send them to friends, turning every player into a puzzle designer. Combined with the embed.js single-tag distribution and the ARG footer rotation, KEYSTONE now has three distinct growth surfaces — curated play, embedded discovery, and user-generated content.