Codex builds Pikachu Volleyball in obscure Korean UmLang

A user tested modern coding agents by asking Codex to port the game Pikachu Volleyball to UmLang, an esoteric Korean meme programming language. The agent successfully completed the project after approximately 41 hours of work.

• The resulting code was benchmarked using headless simulation throughput against native Rust, original JavaScript, and various UmLang virtual machines.
• Performance ranking placed Rust first, followed by Original JS, then UmLang implementations on Rust, Node, and Python VMs.
• Correctness remained consistent across all implementations, with performance differences attributed to runtime overhead.

The project highlights the capability of coding agents to handle extremely low-resource languages and raises questions about how language-specific abstractions might influence future AI interactions.