Codex successfully built an entire game in an obscure Korean esoteric programming language

I wanted to see how far modern coding agents could go on a language that almost nobody uses.

So I picked UmLang, an esoteric programming language created years ago from a Korean internet meme, and asked Codex to port Pikachu Volleyball.

The surprising part was that it actually completed the project (roughly 41 hours of work).

After that, I benchmarked multiple implementations using headless simulation throughput (graphics/audio disabled).

Correctness was consistent across implementations; the differences mainly came from runtime overhead.

If future "Sovereign AI" systems are trained around programming languages influenced by specific natural languages (Korean, Japanese, etc.), could developers obtain better interactions because the abstractions more closely match their native way of reasoning?

I'm not claiming that's true—just that this project unexpectedly made me think about it.