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I built a Command & Conquer style RTS called Battle Drones, mainly using Claude Opus 5.5, which runs in the browser and includes device-to-device multiplayer over an audio link simonwillison.net/2026/Oct/20/...

In addition to human-vs-in-game-AI and human-vs-human it supports two LLMs playing against each other! That works by pausing the game every 5s for them to think about the game state and queue up commands Here's a replay link for Haiku 5.5 vs GPT-6 Luna: simonw.github.io/battledrones...

Claude generated all of the 3D models (in Three.js) - here's a model explorer that lists them all plus their animation states. My favorite is the giant "Goliath" stomping mech simonw.github.io/battledrones...

Warning if you're going to try this: the audio multiplayer plays a high pitched noise throughout the game - annoying at best, and at worst might give you an actual headache (Natalie: "why do my teeth hurt?")