The use of generative AI is on the rise across the board, and the gaming industry is no exception. Even titles claiming to be AAA are incorporating AI, and Steam, a major PC gaming platform, now requires developers to disclose the use of generative AI elements on their store pages. Amidst this, a game has caught attention by claiming that it was built entirely on AI, going beyond just using it for certain parts.

That game is 'CODEX MORTIS', which has been offering a free demo on Steam since the 10th. It is a Vampire Survivors-like game where you play as a necromancer commanding an undead legion to build your loadout. You can plan your build before playing, and as you complete missions, you can grow stronger based on various combinations. It supports both single-player and local co-op play.

The developer, 'GROLAF', highlighted '100% AI-based development' as a key feature. Art, sound, music, and text were created using generative AI, and the coding was also done via 100% 'vibe coding' based on AI. Vibe coding is a method of writing code with the help of generative AI, where you can code by entering prompts in natural language.

Steam user reviews for the demo are 'Mixed' with 33 reviews. Positive feedback noted that being able to build a loadout before the main combat prevents gameplay from being overly dependent on luck, providing a sense of control and clear 'synergy' effects when adding options to characters. On the other hand, some users expressed aversion to the use of AI itself, and others pointed out a general lack of polish. Both positive and negative reviews mentioned that optimization is a drawback.

The CODEX MORTIS demo is currently available on Steam and officially supports Korean.