CODEX MORTIS

Bullet-hell survival with spell decks, mutations, and undead armies

GROLAF · Published by CRUNCHFEST · Released Sep 24, 2026

Reviews: Very Positive; 80% of 97
Recent reviews: Very Positive; 90% of 21 in 30 days
Players: 5; daily peak, Oct 28, 2026
Steam Deck: Verified
Last update on Steam: 4 days ago; Oct 24, 2026
Minimum PC: GeForce GTX 650; 4 GB RAM · 0.1 GB disk; Full requirements

What is CODEX MORTIS?

You play a necromancer in an isometric dark-fantasy action roguelite, casting spells against undead hordes across separate missions. Before each mission, you build a deck from spells you own; points earned during runs buy packs that expand your collection.

For you if...

+you like combining magic schools to experiment with builds
+you want local co-op or online parties of four

Not for you if...

−you prefer small skirmishes over fighting large enemy hordes

What players say

80% of 97 reviews are positive · 90% of 21 in the last 30 days

Players praise the visuals, but recurring complaints include repetitive play and frame-rate drops.

Screenshots and trailer

CODEX MORTIS system requirements

Minimum: GeForce GTX 650, 4 GB RAM, 0.1 GB of disk space.

As published by the developer.

Can my PC run CODEX MORTIS?

Tell us your graphics card once and every game page will answer this for you.

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Minimum

OS: Windows 11
Processor: Intel Core i3-2100 / AMD FX-4300
Graphics: NVIDIA GeForce GTX 650 / AMD Radeon HD 7750 / Intel HD Graphics 4000 / 1 GB VRAM
Memory: 4 GB RAM
Storage: 140 MB available space

Does CODEX MORTIS have co-op or multiplayer?

Yes: co-op online and split-screen. It also has a single-player mode.

Does CODEX MORTIS run on Steam Deck?

Verified Yes, Verified by Valve: it works on Steam Deck out of the box.

All functionality is accessible with the default controller configuration
Shows Steam Deck controller icons
In-game text is legible on Steam Deck
Default graphics settings perform well on Steam Deck
Singleplayer gameplay requires active internet connection

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows, Linux
Achievements: 92
Steam features: Cloud saves, Family Sharing
Languages: Text only: English, French, Italian, German, Spanish - Spain, Bulgarian, Simplified Chinese, Czech, Danish, Finnish, Greek, Spanish - Latin America, Dutch, Indonesian, Japanese, Korean, Norwegian, Polish, Portuguese - Portugal, Portuguese - Brazil, Russian, Romanian, Swedish, Thai, Turkish, Ukrainian, Vietnamese, Hungarian.

Does CODEX MORTIS use AI-generated content?

Yes. The developers disclose AI-generated content on the game's Steam page:

AI is used for entire code of the game, text, arts, sounds and music.

The statement mentions: ArtMusic & soundText & translationsCode

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam