Create an xAI / Grok account if you do not have one.
Install or open Grok Build (desktop CLI / TUI).
Download the Rampart source zip from this page and unzip it.
Open that folder as your workspace in Grok Build.
Use a first prompt like the one below — keep multiplayer intact.
Re-zip the game root (must include index.html + module.manifest.json) and upload here.
Example first prompt:
Open this Rampart Reborn folder. Keep multiplayer (PeerJS, room codes,
Ready flow, module.manifest.json protocolVersion) intact. Tweak wall HP
and cannon ammo for a faster siege, then tell me what you changed.