GameLamp

Take a turn. Text the board.

GameLamp is tic-tac-toe and Connect 4 over SMS, in the same spirit as Game Pigeon. You play a move, send a link, and the other person sees that board in the iMessage preview before they tap through.

Live: d3spvqcd90i9d.cloudfront.net

GameLamp tic-tac-toe Open Graph board

How the preview works

Every turn URL ships og:title, og:description, and a 900x900 og:image of the current position. Crawlers unfurl the game, not a generic logo.

Tic-tac-toe: boards are pre-rendered on S3 at /og/tictactoe/{board}.png.
Connect 4: too many legal boards to pre-render. /og/connect4/{42 trits}.png is painted at request time by Lambda@Edge.

Stack

Web app: React + TypeScript (Vite), hosted as static files on S3
CDN: CloudFront in front of the bucket, HTTPS only
Turn HTML: CloudFront Functions on tictactoe/* and connect4/* decode the turn blob and return OG-tagged HTML
Connect 4 art: Lambda@Edge origin-request handler, 512 MB, 10s timeout
Tic-tac-toe art: precomputed PNGs deployed next to the app

The whole product is the share link. There is no app install and no game server. State lives in the URL, the preview is the board, and SMS is just how the turn gets to the other person.