2d platformer game built with Codex (zero code)
Hi HN! On Sunday I spent a couple of hours building a short 2d platformer ("Prince of Persia" style). What's interesting is how I built it. I went for a zero-code approach, and built the whole thing using OpenAI Codex CLI and agent skills (with the progressive disclosure paradigm). You can play the game here: https://acatovic.github.io/gothicvania-codex-demo/ You can see the full code, agent skills and a complete writeup here: https://github.com/acatovic/gothicvania-codex-demo Some takeaways: * This was one of the most enjoyable experiences ever! *…
2d platformer game built with Codex (zero code) launched on February 16, 2026 with 10 votes, #1,047 of 16,628 launches that month and more than 90% of that year's launches.
In plain words
A 2D platformer game in the style of Prince of Persia, created without writing code by using OpenAI Codex CLI and agent skills. The developer built the entire game in a couple of hours using a zero-code approach with progressive disclosure paradigm and automated implement-evaluate loops. Players can try the game online, and the full source code and documentation are available on GitHub for those interested in how it was constructed.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN! On Sunday I spent a couple of hours building a short 2d platformer ("Prince of Persia" style). What's interesting is how I built it. I went for a zero-code approach, and built the whole thing using OpenAI Codex CLI and agent skills (with the progressive disclosure paradigm). You can play the game here…
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