World's First Game Made Entirely By AI Now Available on Steam: Everything You Need to Know About Codex Mortis

Codex Mortis has launched a playable demo on Steam and is drawing attention for one main reason. The team behind this necromantic shooter claims it is “the world's first fully playable game created 100% through AI”, raising questions about how far artificial intelligence should shape future game development.

The developers describe Codex Mortis as a 'necromantic survival bullet hell', where players form a “death squad” and fight off waves of demonic creatures. The action centres on collecting 'ancient pages' while an immortal boss stalks the map, a loop that invites clear comparisons with indie hit Vampire Survivors.

Codex Mortis AI Game Gameplay, Genre, and Core Details

On Steam, Codex Mortis is pitched as dark fantasy action with co-op options and flexible character builds. Its bio reads: “Death is your weapon. Mix five schools of dark magic, unleash devastating spell synergies, and raise undead armies in this necromantic bullet hell. Infinite builds, solo or co-op – embrace the forbidden and dominate. 100% AI-driven development.”

Key information about the Codex Mortis AI game is outlined below for quick reference.

Codex Mortis AI Game Development Claims and PR Pitch

Public materials for the Codex Mortis AI game were sent out by Darek Crunchfest, who highlighted that the title is built “entirely through AI algorithms and tools”. Crunchfest added in the email, “Oh, and one more thing: it's probably the world's first fully playable game created 100% through AI.”

The developer GROLAF does not hide that stance, stressing in the Steam description that Codex Mortis is wholly AI-driven. The trailer on Steam looks obviously machine-generated, with common AI artefacts in character movement and backgrounds. There is no attempt to pass the visuals off as traditionally produced animation.

Codex Mortis AI game comparisons and community debate

The PR email for Codex Mortis tried to place the AI game in a familiar context for players. It described the design as “Vampire Survivors meets Guild Wars-style builds.” Fans of Vampire Survivors may find the concept visually familiar, though opinions will likely split over the degree of AI involvement in the project.

For some players and small studios, AI tools are seen as a useful shortcut that helps individuals or tiny teams ship games at lower cost. Others remain uneasy about titles like Codex Mortis being developed almost entirely through automated systems, especially when those games are then heavily promoted around that fact.