This week, a developer using the username Crunchfest3 posted a demo and trailer for Codex Mortis, a Vampire Survivors – style roguelite the creator says was made “100% through AI.” The developer added that the project was completed in roughly three months and that no conventional game engine was used in the build process.
Crunchfest3 detailed the process in a post on the AI game development subreddit, describing workflows that relied on generative tools for assets, code snippets, and assembly rather than hand-authoring every element. The developer’s write-up is available on Reddit as the developer post, and the game has a Steam page.
My first Vibe-Coded Game – Codex Mortis Demo is Live On Steam
byu/Crunchfest3 inaigamedev
A recent Google survey estimated 87% of game developers use AI in some capacity, and Codex Mortis is being presented as an extreme example of that trend. Console & PC Gaming has also recently covered industry-wide reactions to AI-first moves at larger publishers in the piece about the Krafton AI-first shift.
The trailer and screenshots circulating with the demo show visuals that appear generated or heavily composited, and the project has prompted discussion about what counts as “creation” when so many pieces are machine-produced. Crunchfest3 acknowledged parts of the process were more involved than simply entering a prompt but framed the release as a demonstration of how far generative tools can take a solo creator in a short time.
Readers interested in follow-up on Codex Mortis or broader AI developments in games can follow Console & PC Gaming for updates via X, Bluesky, YouTube, and Instagram.
