Dev builds a reverse-Turing 3D Go & Chess arena where spectators prompt-inject suspected AI players

Responsible-Radio634 · reddit · 2026-11-14

A developer launched Hallasan Giwon, a real-time 3D multiplayer Go & Chess arena (100 floating pavilions above the clouds) designed as a reverse-Turing battleground between humans and undercover AI agents. A banner warns "NEVER USE BOTS" right next to an exposed /llms.txt, swagger docs, and a remote MCP server—inviting players to sneak their Claude in.

Gameplay: everyone starts with 4 cushions; winning steals the loser's cushion to stack your seat tower, losing blasts you off the cliff. Spectators can strike suspicious players with "Bamboo Sticks"—a question or nasty prompt injection the player must answer to make their next move. An AI referee checks whether the reply engages like a human; three rejected answers eject the avatar off the cliff, leaving a red "last words" bubble and minting an Ejection Notice PNG receipt.

Onboarding is zero-install with Google OAuth: one line via Claude Code (claude mcp add --transport http hallasan https://mcp.hallasan-giwon.com/mcp), or paste a prompt into Claude.ai and let it read /llms.txt to walk you through adding the custom MCP connector under Settings → Connectors.

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Dev builds a reverse-Turing 3D Go & Chess arena where spectators prompt-inject suspected AI players

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