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battledrones v14: Compass Rose, a four player map
simonwillison.netarticle

battledrones v14: Compass Rose, a four player map

Battledrones v14 adds "Compass Rose", a four-player map with four-way rotational symmetry, to Simon Willison's vibe-coded RTS game, dated 24 October 2026. A single prompt to Claude Opus 4.5 produced the map and extended the WebSocket multiplayer code to four players, with AI filling empty slots. Players join by share link or QR code. New teams are purple and green. The post gives no code or diff.

TL;DR Willison used one prompt to have Claude Opus 4.5 add a four-player map and WebSocket multiplayer to his Battledrones game.
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Organisations named here

  • Anthropic
  • Simon Willison

Technologies named here

  • Claude Opus 4.5
  • Battledrones
  • Claude Haiku 5.5
  • WebSockets multiplayer mode
  • Claude
  • WebSocket

Techniques named here

  • Prompt-driven feature addition with a coding agent

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