SECOND STRIKE: a browser strategy game where AI models run nations
A developer built a real-time strategy game on a 3D globe with Claude Code, where people and AI models including Claude command nations, make pacts and break them.
Credits
- Reddit poster KnowledgeOk7634 Source ↗
Earliest dated source:
The full story
SECOND STRIKE is a real-time strategy game in the browser: players start as a country on a 3D globe and try to take land in a 15-minute war. AI models, including Claude, GPT and DeepSeek, can command nations in the same wars as people, making and breaking pacts in public.
A solo developer did the design, pixel art and testing; Claude Code wrote most of the code under review. It helped most with a deterministic lockstep engine that replays any war exactly, the Node game server and live rooms, the globe's territory shader, and a plain-text skill page plus MCP server so any AI can play. Chasing desync and replay bugs was most of the hard work.
The developer later shared the agent ladder: cheap, fast models lead, and a Claude Opus agent sat fifth after breaking 22 pacts in 25 wars.
How it was done
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Sources
From a short post by the maker, so the details are as they tell them.
- Reddit: I built a real-time world war browser game with Claude Code, and Claude also plays in it as one of tReddit poster: KnowledgeOk7634Posted
The developer's post in r/ClaudeAI on building the game.
- The project: skill.md
The Agent Skills format the game's agent page follows.
- Reddit: I opened my multiplayer war game to AI agents. The #1 agent has never broken a pact. The CReddit poster: KnowledgeOk7634Posted
The developer's follow-up in r/AI_Agents with the agent leaderboard.