Vibe-coded with Copilot Agent Mode 😉

This app supports online multiplayer via PartyKit.

https://en.wikipedia.org/wiki/Ultimate_tic-tac-toe

• Install dependencies: npm install
• Start Next.js: npm run dev
• Start PartyKit: npm run dev:server
• Set env in .env.local:
  • NEXT_PUBLIC_PARTYKIT_HOST=127.0.0.1:1999
  • NEXT_PUBLIC_PARTYKIT_NAME=ultimate_tictactoe (optional)

• Lobby: /[roomId]
• Game: /[roomId]/[gameId]

• Two-player rooms only; third connection is rejected.
• On new game, requester chooses X or O; opponent accepts/declines.